release: 发布 v0.4.5

新增能力：Web 与 Desktop 支持新建和保存 Markdown；桌面端注册 .md/.markdown 打开程序，支持单实例文件转交、自定义主题目录以及窗口位置、尺寸和最大化状态的延迟原子持久化与屏幕越界修正。

界面与兼容性：保留打开 Markdown 为独立主操作，将新建、保存和主题目录收纳到更多菜单；Web 移除本地素材目录入口并明确默认不支持本地素材；新文档默认使用一级标题或首行合法化生成文件名，可不保存直接导出 PDF。

渲染修复：图片、Mermaid 和 ECharts 按文档顺序串行执行媒体分页回填，每个媒体元素至多重排一次；图片以限宽后的高度作为缩放基准，只缩放媒体主体并保持标题尺寸；ECharts 冻结为 SVG 图片后参与统一分页。

示例与文档：默认示例仅保留一张网络图片，增加有效 Base64 横图、竖图、边界图片及多尺寸 Mermaid/ECharts；更新根 README、Desktop README、部署文档、四个 packages README、PROGRESS 和 AGENTS 发布规范；登记 v0.4.6 超链接导航问题。

部署与验证：构建并运行 yixiong/md-to-pdf:v0.4.5 正式镜像，Compose 健康且 PDF 冒烟无 Mermaid/ECharts 错误；生成 NSIS 安装包和免安装 ZIP，本机已升级到 NSIS v0.4.5 并清理旧 Squirrel 安装；202 项测试、类型检查、生产构建和 git diff --check 全部通过。

发布产物：Setup.exe SHA-256 9CBD6362E15AA745185805E753D5A7749434E0E142E6CE0F66463E6A19468F1D；ZIP SHA-256 97B2D44E72F626A3396E5AB5B330FFB7F9BECAF945A1707808C876940A82E850；当前 Windows 产物未配置代码签名。

AGENTS.md

@@ -54,7 +54,8 @@ Get-Content -LiteralPath 'docs\PROGRESS.md' -Encoding UTF8
 - 使用固定版本 Chromium 生成真实、可搜索的 PDF 文件；
 - 支持纸张尺寸、方向、页边距、页眉、页脚和多种页码样式；
 - 支持主题清单与 CSS 主题扩展；
-- 支持 Front Matter、表格、任务列表、脚注、代码高亮、KaTeX 和 Mermaid；
+- 支持 Front Matter、表格、任务列表、脚注、代码高亮、KaTeX、Mermaid 和 ECharts；
+- 提供 Web 与 Electron 桌面端，共用渲染、主题和分页核心；
 - 使用 Docker Compose 在内网部署；
 - 文档只在当前请求中临时处理，不建立文档历史数据库。
 
@@ -75,15 +76,18 @@ flowchart LR
 
 - 前端：React、TypeScript、Vite。
 - 后端：Node.js、TypeScript、Fastify。
+- 桌面端：Electron、electron-builder、NSIS。
+- 应用服务：`packages/application`。
 - 共享模型：`packages/core`。
 - Markdown 渲染：`packages/renderer`。
-- PDF 引擎：计划使用 Playwright Chromium。
+- ECharts 协议与运行时：`packages/markdown-echarts`。
+- PDF 引擎：Web 使用固定版本 Playwright Chromium，桌面端使用 Electron Chromium。
 - Markdown：markdown-it 及 `@mdit/plugin-*` 插件。
 - 元数据：gray-matter。
 - 安全过滤：sanitize-html。
 - 代码高亮：highlight.js。
 - 数学公式：KaTeX。
-- 图表：Mermaid。
+- 图表：Mermaid、ECharts。
 - 校验：Zod。
 - 测试：Vitest。
 - 部署：Docker、Docker Compose。
@@ -92,12 +96,14 @@ flowchart LR
 
 ```text
 apps/web/             前端编辑、配置与预览界面
-apps/server/          HTTP API、主题读取及未来 PDF 服务
+apps/server/          HTTP API、主题读取和 Playwright PDF 服务
+apps/desktop/         Electron 桌面壳、IPC、原生文件与 PDF 能力
+packages/application/ 共享应用服务、主题注册和图片资源处理
 packages/core/        导出配置和主题清单等共享模型
 packages/renderer/    Markdown 到安全 HTML 的渲染管线
-themes/               内置主题及未来可安装主题
-docker/               容器化配置
-tests/                跨包和端到端测试
+packages/markdown-echarts/ ECharts YAML 协议、验证和浏览器 SVG 运行时
+themes/               内置主题
+deploy/               Docker、Compose、Nginx 和部署文档
 docs/                 进度、架构和部署文档
 ```
 
@@ -186,6 +192,11 @@ chore: 初始化项目骨架
 ```
 
 - 不修改或重写已有提交，除非用户明确要求。
+- 版本标签必须指向专门的发布提交。发布提交信息使用标准英文前缀
+  `release:`，简体中文正文必须完整列出该版本的新增能力、问题修复、
+  兼容性或部署变化、验证结果和发布产物，不得只写版本号或简略摘要。
+- 版本标签使用 annotated tag；标签说明应与发布提交正文保持一致，完整
+  记录本版本更新，不得使用只有版本号的标签说明。
 
 ## 9. 当前交接入口
 

README.md

@@ -1,26 +1,90 @@
 # Markdown PDF 导出器
 
-一个面向内网部署的 Markdown 排版与 PDF 导出工具。项目目标是使用同一份 HTML 和 CSS 完成网页预览与 Chromium PDF 渲染，并提供纸张、页边距、页眉页脚、页码及主题扩展能力。
+一个同时提供 Web 与 Windows 桌面端的 Markdown 排版、分页预览和 PDF
+导出工具。预览与 PDF 复用同一份安全 HTML、`#write` DOM、主题 CSS 和
+分页运行时，适合内网部署，也可以作为不依赖本地服务的桌面应用使用。
 
-## 当前状态
+当前版本：`v0.4.5`。
 
-已经实现：
+## v0.4.5 主要能力
 
-- React Markdown 编辑与本地文件读取；
-- Fastify 预览接口；
-- 共享导出配置模型；
-- 动态主题清单、CSS 和静态资源接口；
-- Markdown、Front Matter、安全过滤和扩展语法渲染核心；
-- 表格、任务列表、脚注、代码高亮、KaTeX 和 Mermaid；
-- iframe 隔离的真实分页预览、双向滚动同步与主题切换；
-- Chromium PDF 下载、精确 PDF.js 预览与导出性能观测；
-- 五种纸张、页边距、页眉、页码、Mermaid 风格和浏览器配置缓存；
-- 快速预览与精确预览共用的 50%～400% 显示缩放；
-- 内置 Typora 风格、GitHub、Pixyll 和 Whitey 四套主题；
-- Web 素材目录上传、桌面同目录相对图片和受限公网图片下载；
-- 图片标题、整块分页及超高图片单页等比例适配；
-- 无本地 Server 的 Electron 桌面端与 Windows 安装包；
-- 前端、Fastify、Nginx 和 Playwright Chromium 的 AIO 容器部署。
+- 新建、打开和保存 Markdown；新文档可直接导出 PDF；
+- Windows 注册 `.md`、`.markdown` 文件关联，系统打开文件时自动加载；
+- 桌面窗口位置、尺寸和最大化状态延迟持久化，并在多显示器变化后自动
+  修正到可见工作区；
+- “打开 Markdown”保留为独立主按钮，新建、保存和主题目录收纳在“更多”
+  菜单；
+- 桌面端提供可直接放置自定义主题的本地目录；
+- 图片、Mermaid 和 ECharts 采用串行媒体分页：每个媒体块至多重排一次，
+  严格保持文档顺序；
+- 媒体先按内容限宽计算基准高度。当上一页空白接近媒体所需空间时，允许
+  将媒体内容等比例缩小回填；图片标题或图表标题保持原字号且与媒体成块；
+- 示例文档覆盖横图、竖图、Base64 图片、Mermaid、ECharts 以及不同尺寸
+  的分页边界。
+
+## Web 与桌面端
+
+| 能力 | Web / Docker | Windows Desktop |
+| --- | --- | --- |
+| 新建 Markdown | 支持 | 支持 |
+| 打开 Markdown | 浏览器文件选择 | 原生对话框、文件关联、第二实例转交 |
+| 保存 Markdown | 浏览器下载 | 原生另存为 |
+| 相对本地图片 | 默认不支持 | 以 Markdown 所在目录为安全边界 |
+| 远程图片 | 服务端受限下载并内嵌 | 应用服务受限下载并内嵌 |
+| 自定义主题 | Compose 只读挂载目录 | “更多 → 打开自定义主题目录” |
+| PDF 引擎 | 固定版本 Playwright Chromium | Electron 自带 Chromium |
+
+Web 端不提供本地素材目录能力。需要包含本地相对资源的文档时，请使用
+Desktop；Web 端可使用 Base64/Data URL 或受限公网图片。
+
+## 渲染架构
+
+```mermaid
+flowchart LR
+    A["Markdown 与受限资源"] --> B["Renderer 安全渲染"]
+    B --> C["统一 #write HTML"]
+    D["主题 CSS 与导出配置"] --> C
+    C --> E["共享分页运行时"]
+    E --> F["Web 快速预览"]
+    E --> G["Playwright Chromium"]
+    E --> H["Electron Chromium"]
+    G --> I["Web PDF"]
+    H --> J["Desktop PDF"]
+```
+
+快速预览适合编辑反馈；精确预览直接展示服务端生成的 PDF，是 Web 最终
+分页的权威结果。桌面 PDF 复用相同分页载荷和运行时。
+
+## 项目目录
+
+```text
+apps/
+  web/                  React 编辑、设置、快速/精确预览与浏览器文件操作
+  server/               Fastify API、Playwright PDF 与容器运行入口
+  desktop/              Electron 主进程、IPC、原生文件和 Windows 打包
+packages/
+  core/                 跨端文档、导出配置和主题协议
+  renderer/             Markdown 到安全 #write HTML 的渲染管线
+  application/          共享渲染、主题注册和图片资源应用服务
+  markdown-echarts/     ECharts YAML 协议、验证与浏览器 SVG 运行时
+themes/                 内置主题与主题清单
+deploy/                 Dockerfile、Compose、Nginx 和部署文档
+docs/                   项目进度与主题开发说明
+scripts/                主题导入等维护脚本
+logos/                  应用图标源文件
+.local/themes/          本地开发和 Compose 自定义主题目录
+```
+
+包依赖保持单向：`core` 提供基础协议；`markdown-echarts` 提供独立图表
+能力；`renderer` 消费两者生成安全 HTML；`application` 组合渲染器、主题
+和资源用例；三个 `apps/*` 只负责各自平台的界面、传输与 PDF 适配。
+
+各包的目录和用法：
+
+- [application](packages/application/README.md)
+- [core](packages/core/README.md)
+- [renderer](packages/renderer/README.md)
+- [markdown-echarts](packages/markdown-echarts/README.md)
 
 ## 本地开发
 
@@ -33,118 +97,67 @@ npm run dev
 
 默认地址：
 
-- 前端：http://localhost:5173
-- 后端：http://localhost:3001
+- Web：http://localhost:5173
+- API：http://localhost:3001
 - 健康检查：http://localhost:3001/api/health
 
-页面支持直接编辑 Markdown，或选择本地 `.md` 文件。若 Markdown 使用
-相对图片路径，再选择对应的素材目录即可；文件与图片只进入当前渲染请求，
-不写入数据库。桌面端使用原生“打开 Markdown”对话框，并自动从 Markdown
-所在目录安全解析相对图片。
+桌面端开发：
 
-独立一行的 `![图片标题](地址)` 会显示图片标题。图片与标题作为一个整体
-参与分页；超出单页内容区时，图片会在预留标题高度后等比例缩放，不跨页
-切割。远程图片会先由应用服务受限下载并内嵌，失败时显示可诊断占位。
-
-编辑区和分页预览使用双向比例滚动同步。在任意一侧滚动时，另一侧会跟随到相同的全文阅读进度，方便定位并修改较长文档。
-
-预览工具栏支持滑块和手动百分比输入。缩放比例只改变浏览器显示，不改变纸张尺寸、分页结果或最终 PDF，并会单独保存在浏览器中。
-
-## Mermaid 配置与样式
-
-导出设置可以统一控制整篇文档的 Mermaid 布局、主题、外观和字体：
-
-- 布局：Dagre、ELK；
-- 主题：Mermaid 11.16.0 提供的 Default、Base、Dark、Forest、Neutral、Neo 和 Redux 系列；
-- 外观：Classic、Hand-drawn、Neo；
-- 字体：任意本地 CSS 字体族。
-
-未设置时使用 `dagre + default + classic`。单个 Mermaid 区块的 `config` Front Matter 优先于全局导出设置：
-
-````markdown
-```mermaid
----
-config:
-  layout: elk
-  theme: base
-  look: handDrawn
-  fontFamily: Microsoft YaHei
-  themeVariables:
-    primaryColor: "#dbeafe"
-    primaryBorderColor: "#2563eb"
-  flowchart:
-    wrappingWidth: 360
----
-flowchart TB
-  classDef important fill:#fee2e2,stroke:#dc2626
-  A["较长的节点名称<br/>第二行说明"] --> B["下一个节点"]
-  style A fill:#dcfce7,stroke:#16a34a
-  class B important
+```powershell
+npm run desktop:dev
 ```
-````
 
-`style`、`classDef`、`linkStyle`、`themeVariables` 和图表专属配置均由 Mermaid 官方渲染器处理。原始 `themeCSS`、`securityLevel` 和资源限制属于安全配置，不能由 Markdown 代码块覆盖。
+桌面端目录包和 Windows 安装包：
 
-ELK 使用官方 `@mermaid-js/layout-elk`，只有图表实际请求 ELK 时才加载核心布局代码。
-
-### Mermaid 长标签
-
-流程图节点标签的默认最大宽度为 320px，可以通过上例中的 `flowchart.wrappingWidth` 调整。
-
-需要自动换行时可以使用 Mermaid Markdown String：
-
-````markdown
-```mermaid
-flowchart LR
-  A["`这是一段可以由 Mermaid 自动换行的较长节点文字`"]
+```powershell
+npm run desktop:package
+npm run make -w @md-to-pdf/desktop
 ```
-````
 
-个别节点仍需缩小字体时，优先使用 Mermaid 自带的 `classDef`：
+产物位于 `apps/desktop/out/v0.4.5/`。正式安装包命名为
+`md-to-pdf-0.4.5-x86_64-Setup.exe`，同时生成免安装 ZIP；当前发行包
+未配置代码签名。
 
-````markdown
-```mermaid
-flowchart LR
-  A["较长节点"] --> B["普通节点"]
-  classDef compact font-size:12px;
-  class A compact;
-```
-````
+## 文档与媒体
 
-## 内置与本地 Typora 主题
+Markdown 支持 Front Matter、表格、任务列表、脚注、highlight.js、
+KaTeX、Mermaid 和安全的 ECharts YAML 围栏。
 
-公司内部版本已经内置 GitHub、Pixyll 和 Whitey 三套适合打印的白色
-Typora 默认主题。如需从本机 Typora 安装目录刷新本地开发副本，可以运行：
+独立一行的 `![标题](地址)` 会生成带标题的图片块。分页引擎将图片、
+Mermaid、ECharts 及其紧邻标题视为不可拆分媒体块，并按文档顺序串行
+计算。图片的缩放基准是原图先收缩到内容限宽后的高度；需要回填上一页时
+只缩放媒体内容，不缩放标题。这样可利用接近可容纳的页尾空白，同时避免
+跨页、重复重排和后续媒体顺序变化。
+
+ECharts 围栏语法、支持系列和安全边界详见
+[markdown-echarts 包文档](packages/markdown-echarts/README.md)。
+
+## 主题
+
+仓库内置 Typora 风格、GitHub、Pixyll 和 Whitey 四套主题。主题由
+版本化 `theme.json` 清单、主体 CSS、可选基础 CSS、打印 CSS 和资源组成。
+
+- 本地开发与 Compose：将主题目录放入 `.local/themes/`；
+- Desktop：从“更多 → 打开自定义主题目录”打开实际安装目录，再放入主题；
+- 主题格式、安全限制和资源引用详见[主题开发指南](docs/THEMES.md)。
+
+Compose 会把 `.local/themes` 只读挂载到容器。Typora 主题导入脚本只用于
+刷新本地开发副本：
 
 ```powershell
 npm run theme:import-typora
 ```
 
-默认从 Typora 安装目录的 `resources\style` 读取基础 CSS、主题和资源，写入 `.local\themes\typora-*`。启动开发服务后，这些主题会出现在预览页面的主题选择器中。
-
-导入工具不会默认覆盖已存在的目标。确认替换本地副本时使用：
-
-```powershell
-npm run theme:import-typora -- --replace
-```
-
-旧副本会移动到 `.local\theme-backups`。
-
-本地主题由动态主题注册器加载，CSS 中的相对字体和图片会通过受限资源接口提供。外部 URL、越界路径和符号链接逃逸会被拒绝。
-
-自定义主题目录、`theme.json`、CSS 组合顺序、资源引用和安全限制详见 [主题开发指南](docs/THEMES.md)。
-
-## Docker Desktop 部署
+## Docker Compose 部署
 
 ```powershell
 docker compose -f deploy\compose.yaml up --build -d
 ```
 
-默认访问地址为 http://localhost:8080。Compose 会将 `.local/themes`
-作为只读主题目录挂载；端口、主题目录和 PDF 并发参数的配置方式详见
-[AIO 容器部署说明](deploy/README.md)。
+默认访问 http://localhost:8080。端口、镜像、主题挂载、PDF 并发和超时
+配置详见 [AIO 容器部署说明](deploy/README.md)。
 
-## 测试与构建
+## 验证
 
 ```powershell
 npm test
@@ -153,8 +166,18 @@ npm run build
 git diff --check
 ```
 
-## 隐私原则
+涉及分页或 PDF 的改动还应使用包含中文、长表格、代码、公式、图片、
+Mermaid、ECharts 和分页边界的示例完成 Web、Compose 与 Desktop 端到端
+验证，并检查 PDF 页面渲染结果。
 
-文档内容与图片仅用于当前渲染和转换请求，不接入数据库或文档历史存储。
-相对路径会规范化并限制在所选目录内；路径穿越、符号链接越界、内网远程
-地址、超出数量或大小上限的图片会被拒绝或替换为失败占位。
+## 安全与隐私
+
+- 不建立 Markdown、图片或 PDF 历史数据库；
+- 文档和资源只在当前请求或当前桌面会话中处理；
+- Markdown 原始 HTML 不执行，输出经过白名单过滤；
+- Mermaid 使用严格安全模式，ECharts 只接受受限纯数据 YAML；
+- 本地资源阻止路径穿越和符号链接越界；
+- 远程资源阻止内网地址，并限制数量、单文件大小、总大小和超时；
+- PDF 页面阻止未授权外部网络访问。
+
+当前实现与交接状态详见 [docs/PROGRESS.md](docs/PROGRESS.md)。

apps/desktop/README.md

@@ -1,9 +1,19 @@
 # Desktop 桌面端
 
-`apps/desktop` 是 `v0.4.0` 新增的 Electron 桌面应用。当前已经完成
-Electron 壳、受限 preload、进程内应用服务、原生 Markdown 文件选择、
-同目录图片解析、隐藏分页窗口、Electron Chromium PDF 输出、原生 PDF
-另存为和 Windows 安装包验证。
+`apps/desktop` 是 Electron 桌面应用。当前已经完成 Electron 壳、受限
+preload、进程内应用服务、原生 Markdown 打开与保存、同目录图片解析、
+本地主题目录、隐藏分页窗口、Electron Chromium PDF 输出和 Windows
+安装包。
+
+桌面端会记住上次窗口的位置、尺寸和最大化状态；窗口变化后延迟写入，
+异常退出后也能恢复。恢复时会按当前显示器工作区修正位置与尺寸，避免窗口
+落在屏幕外。Windows 安装包会注册 `.md` 和 `.markdown` 文件关联，
+双击文件或使用“打开方式”会复用已有应用窗口并加载文档。
+
+“打开 Markdown”是顶部独立主操作；新建文档、保存 Markdown 和打开
+自定义主题目录收纳在“更多”菜单中。新建文档未保存时显示“未命名文档”，
+首次保存默认使用一级标题作为文件名；没有一级标题时使用首行文本，并会
+自动清理 Windows 非法文件名字符。新文档无需先保存即可直接导出 PDF。
 
 ## 开发
 
@@ -26,10 +36,18 @@ npm run desktop:package
 npm run make -w @md-to-pdf/desktop
 ```
 
-版本化目录包、Squirrel `Setup.exe` 和 ZIP 输出到
-`apps/desktop/out/v0.4.2/`。该目录被 Git 忽略。公司内部分发以
-`Setup.exe` 为正式安装包，ZIP 作为免安装辅助包；当前未配置代码签名，
-Windows 首次运行可能显示“未知发布者”提示。
+版本化目录包、NSIS `Setup.exe` 和 ZIP 输出到
+`apps/desktop/out/v0.4.5/`。该目录被 Git 忽略。公司内部分发以
+`md-to-pdf-0.4.5-x86_64-Setup.exe` 为正式安装包，ZIP 作为免安装
+辅助包；当前未配置代码签名，Windows 首次运行可能显示“未知发布者”
+提示。
+
+NSIS 使用标准辅助安装模式，支持选择当前用户/所有用户安装和自定义安装
+目录，并创建桌面及开始菜单快捷方式。正式安装包作为 Gitea Release 附件
+发布，不提交进 Git 历史。
+
+桌面和开始菜单快捷方式由 `build/installer.nsh` 显式创建，安装完成后的
+“运行”操作直接启动 `md-to-pdf.exe`，不依赖快捷方式文件。
 
 产品名称、窗口标题、安装包名称和开始菜单名称保持为
 “Markdown PDF 导出器”，实际 Windows 主程序与进程文件固定为
@@ -39,6 +57,9 @@ Windows 首次运行可能显示“未知发布者”提示。
 Web 静态资源作为只读资源放在 Electron `resources/dist` 下，生产环境通过
 `mdpdf://bundle/` 自定义协议加载。
 
+发行包只保留 Electron 的简体中文和英文语言包，其他 Chromium 运行时
+组件保持完整，以兼顾安装体积和不同 Windows 图形环境下的运行可靠性。
+
 ## 安全边界
 
 - 应用窗口和 PDF 窗口均关闭 Node Integration；

apps/desktop/build/installer.nsh

@@ -0,0 +1,64 @@
+!macro customInstall
+  WriteRegStr SHCTX \
+    "Software\Classes\MarkdownPdfExporter.Markdown" \
+    "" \
+    "Markdown 文档"
+  WriteRegStr SHCTX \
+    "Software\Classes\MarkdownPdfExporter.Markdown\DefaultIcon" \
+    "" \
+    '"$INSTDIR\md-to-pdf.exe",0'
+  WriteRegStr SHCTX \
+    "Software\Classes\MarkdownPdfExporter.Markdown\shell\open\command" \
+    "" \
+    '"$INSTDIR\md-to-pdf.exe" "%1"'
+  WriteRegStr SHCTX \
+    "Software\Classes\.md\OpenWithProgids" \
+    "MarkdownPdfExporter.Markdown" \
+    ""
+  WriteRegStr SHCTX \
+    "Software\Classes\.markdown\OpenWithProgids" \
+    "MarkdownPdfExporter.Markdown" \
+    ""
+  WriteRegStr SHCTX \
+    "Software\Classes\Applications\md-to-pdf.exe\shell\open\command" \
+    "" \
+    '"$INSTDIR\md-to-pdf.exe" "%1"'
+  WriteRegStr SHCTX \
+    "Software\Classes\Applications\md-to-pdf.exe\SupportedTypes" \
+    ".md" \
+    ""
+  WriteRegStr SHCTX \
+    "Software\Classes\Applications\md-to-pdf.exe\SupportedTypes" \
+    ".markdown" \
+    ""
+  CreateDirectory "$SMPROGRAMS\Markdown PDF 导出器"
+  CreateShortCut \
+    "$SMPROGRAMS\Markdown PDF 导出器\Markdown PDF 导出器.lnk" \
+    "$INSTDIR\md-to-pdf.exe" \
+    "" \
+    "$INSTDIR\md-to-pdf.exe"
+  CreateShortCut \
+    "$DESKTOP\Markdown PDF 导出器.lnk" \
+    "$INSTDIR\md-to-pdf.exe" \
+    "" \
+    "$INSTDIR\md-to-pdf.exe"
+  StrCpy $launchLink "$INSTDIR\md-to-pdf.exe"
+  System::Call 'shell32::SHChangeNotify(i 0x08000000, i 0, i 0, i 0)'
+!macroend
+
+!macro customUnInstall
+  DeleteRegValue SHCTX \
+    "Software\Classes\.md\OpenWithProgids" \
+    "MarkdownPdfExporter.Markdown"
+  DeleteRegValue SHCTX \
+    "Software\Classes\.markdown\OpenWithProgids" \
+    "MarkdownPdfExporter.Markdown"
+  DeleteRegKey SHCTX \
+    "Software\Classes\Applications\md-to-pdf.exe"
+  DeleteRegKey SHCTX \
+    "Software\Classes\MarkdownPdfExporter.Markdown"
+  Delete "$SMPROGRAMS\Markdown PDF 导出器\Markdown PDF 导出器.lnk"
+  RMDir "$SMPROGRAMS\Markdown PDF 导出器"
+  Delete "$DESKTOP\Markdown PDF 导出器.lnk"
+  System::Call 'shell32::SHChangeNotify(i 0x08000000, i 0, i 0, i 0)'
+!macroend

apps/desktop/electron-builder.config.cjs

@@ -0,0 +1,72 @@
+const path = require("node:path");
+const { version } = require("./package.json");
+
+const windowsIcon = path.resolve(
+  __dirname,
+  "../../logos/desktop/windows/app.ico"
+);
+
+module.exports = {
+  appId: "com.md-to-pdf.desktop",
+  productName: "Markdown PDF 导出器",
+  copyright: "Copyright © YIXIONG Tech.ltd",
+  asar: true,
+  electronLanguages: ["zh-CN", "en-US"],
+  directories: {
+    output: `out/v${version}`
+  },
+  files: [
+    "dist/**/*",
+    "package.json"
+  ],
+  extraResources: [
+    {
+      from: "../web/dist",
+      to: "dist",
+      filter: ["**/*"]
+    },
+    {
+      from: "../../themes",
+      to: "themes",
+      filter: ["**/*"]
+    },
+    {
+      from: windowsIcon,
+      to: "app.ico"
+    },
+    {
+      from: "../../logos/desktop/macos/app.icns",
+      to: "app.icns"
+    }
+  ],
+  win: {
+    target: [
+      {
+        target: "nsis",
+        arch: ["x64"]
+      },
+      {
+        target: "zip",
+        arch: ["x64"]
+      }
+    ],
+    icon: windowsIcon,
+    executableName: "md-to-pdf",
+    artifactName: `md-to-pdf-${version}-x86_64.\${ext}`
+  },
+  nsis: {
+    oneClick: false,
+    allowToChangeInstallationDirectory: true,
+    perMachine: false,
+    allowElevation: true,
+    createDesktopShortcut: false,
+    createStartMenuShortcut: false,
+    shortcutName: "Markdown PDF 导出器",
+    uninstallDisplayName: "Markdown PDF 导出器",
+    installerIcon: windowsIcon,
+    uninstallerIcon: windowsIcon,
+    installerLanguages: ["zh_CN"],
+    include: "build/installer.nsh",
+    artifactName: `md-to-pdf-${version}-x86_64-Setup.\${ext}`
+  }
+};

apps/desktop/forge.config.cjs

@@ -1,47 +0,0 @@
-const path = require("node:path");
-const windowsIcon = path.resolve(
-  __dirname,
-  "../../logos/desktop/windows/app.ico"
-);
-const macosIcon = path.resolve(
-  __dirname,
-  "../../logos/desktop/macos/app.icns"
-);
-const { version } = require("../../package.json");
-
-module.exports = {
-  buildIdentifier: `v${version}`,
-  packagerConfig: {
-    asar: true,
-    prune: false,
-    executableName: "md-to-pdf",
-    icon: process.platform === "darwin" ? macosIcon : windowsIcon,
-    ignore: [
-      /^\/node_modules(?:\/|$)/,
-      /^\/out(?:\/|$)/,
-      /^\/src(?:\/|$)/,
-      /^\/tests(?:\/|$)/,
-      /^\/tsconfig\.json$/
-    ],
-    extraResource: [
-      path.resolve(__dirname, "../web/dist"),
-      path.resolve(__dirname, "../../themes"),
-      windowsIcon,
-      macosIcon
-    ]
-  },
-  makers: [
-    {
-      name: "@electron-forge/maker-squirrel",
-      config: {
-        name: "markdown_pdf_exporter",
-        exe: "md-to-pdf.exe",
-        setupIcon: windowsIcon
-      }
-    },
-    {
-      name: "@electron-forge/maker-zip",
-      platforms: ["win32", "darwin"]
-    }
-  ]
-};

apps/desktop/package.json

@@ -1,32 +1,28 @@
 {
   "name": "@md-to-pdf/desktop",
-  "version": "0.4.2",
+  "version": "0.4.5",
   "private": true,
   "productName": "Markdown PDF 导出器",
   "description": "Markdown PDF 导出器桌面端",
-  "author": "md-to-pdf contributors",
+  "author": "YIXIONG Tech.ltd",
   "type": "module",
   "main": "dist/main.js",
-  "dependencies": {
-    "@md-to-pdf/application": "0.4.1"
-  },
   "scripts": {
     "build": "npm run clean && npm run build:main && npm run build:preload",
     "build:main": "node scripts/build-main.mjs",
     "build:preload": "esbuild src/app-preload.ts src/pdf-preload.ts --bundle --platform=node --format=cjs --external:electron --outdir=dist --out-extension:.js=.cjs",
     "clean": "node -e \"require('node:fs').rmSync('dist',{recursive:true,force:true})\"",
     "dev": "npm run build && wait-on http://localhost:5173 && electron dist/main.js --web-url=http://localhost:5173",
-    "package": "npm run build && electron-forge package",
-    "make": "npm run build && electron-forge make",
+    "package": "npm run build && electron-builder --dir --config electron-builder.config.cjs --x64",
+    "make": "npm run build && electron-builder --win nsis zip --config electron-builder.config.cjs --x64",
     "test": "vitest run",
     "typecheck": "tsc -p tsconfig.json --noEmit --pretty false"
   },
   "devDependencies": {
-    "@electron-forge/cli": "7.11.2",
-    "@electron-forge/maker-squirrel": "7.11.2",
-    "@electron-forge/maker-zip": "7.11.2",
+    "@md-to-pdf/application": "0.4.1",
     "@types/node": "^24.10.1",
     "electron": "43.2.0",
+    "electron-builder": "26.15.3",
     "esbuild": "^0.25.0",
     "typescript": "^5.9.3",
     "vitest": "^4.1.10",

apps/desktop/src/app-preload.ts

@@ -2,16 +2,40 @@ import { contextBridge, ipcRenderer } from "electron";
 import type { PagedDocumentPayload } from "@md-to-pdf/core";
 import type { MarkdownRenderRequest } from "@md-to-pdf/application";
 import {
+  DESKTOP_CONSUME_PENDING_MARKDOWN,
+  DESKTOP_DISCARD_PENDING_MARKDOWN,
   DESKTOP_GET_THEME_CSS,
   DESKTOP_GENERATE_PDF,
   DESKTOP_LIST_THEMES,
+  DESKTOP_MARKDOWN_OPENED,
   DESKTOP_OPEN_MARKDOWN,
+  DESKTOP_OPEN_THEME_DIRECTORY,
+  DESKTOP_REFRESH_THEMES,
   DESKTOP_RENDER_MARKDOWN,
+  DESKTOP_SAVE_MARKDOWN,
+  DESKTOP_START_NEW_MARKDOWN,
   DESKTOP_SAVE_PDF
 } from "./channels.js";
 
 contextBridge.exposeInMainWorld("mdToPdfDesktop", {
   openMarkdown: () => ipcRenderer.invoke(DESKTOP_OPEN_MARKDOWN),
+  consumePendingMarkdown: () =>
+    ipcRenderer.invoke(DESKTOP_CONSUME_PENDING_MARKDOWN),
+  discardPendingMarkdown: () =>
+    ipcRenderer.invoke(DESKTOP_DISCARD_PENDING_MARKDOWN),
+  onMarkdownOpened: (listener: () => void) => {
+    const handleOpened = () => listener();
+    ipcRenderer.on(DESKTOP_MARKDOWN_OPENED, handleOpened);
+    return () =>
+      ipcRenderer.removeListener(DESKTOP_MARKDOWN_OPENED, handleOpened);
+  },
+  startNewMarkdown: () =>
+    ipcRenderer.invoke(DESKTOP_START_NEW_MARKDOWN),
+  saveMarkdown: (fileName: string, markdown: string) =>
+    ipcRenderer.invoke(DESKTOP_SAVE_MARKDOWN, fileName, markdown),
+  openThemeDirectory: () =>
+    ipcRenderer.invoke(DESKTOP_OPEN_THEME_DIRECTORY),
+  refreshThemes: () => ipcRenderer.invoke(DESKTOP_REFRESH_THEMES),
   renderMarkdown: (input: MarkdownRenderRequest) =>
     ipcRenderer.invoke(DESKTOP_RENDER_MARKDOWN, input),
   listThemes: () => ipcRenderer.invoke(DESKTOP_LIST_THEMES),

apps/desktop/src/channels.ts

@@ -2,6 +2,20 @@ export const DESKTOP_RENDER_MARKDOWN =
   "md-to-pdf:desktop:render-markdown";
 export const DESKTOP_OPEN_MARKDOWN =
   "md-to-pdf:desktop:open-markdown";
+export const DESKTOP_CONSUME_PENDING_MARKDOWN =
+  "md-to-pdf:desktop:consume-pending-markdown";
+export const DESKTOP_DISCARD_PENDING_MARKDOWN =
+  "md-to-pdf:desktop:discard-pending-markdown";
+export const DESKTOP_MARKDOWN_OPENED =
+  "md-to-pdf:desktop:markdown-opened";
+export const DESKTOP_START_NEW_MARKDOWN =
+  "md-to-pdf:desktop:start-new-markdown";
+export const DESKTOP_SAVE_MARKDOWN =
+  "md-to-pdf:desktop:save-markdown";
+export const DESKTOP_OPEN_THEME_DIRECTORY =
+  "md-to-pdf:desktop:open-theme-directory";
+export const DESKTOP_REFRESH_THEMES =
+  "md-to-pdf:desktop:refresh-themes";
 export const DESKTOP_LIST_THEMES =
   "md-to-pdf:desktop:list-themes";
 export const DESKTOP_GET_THEME_CSS =

apps/desktop/src/main.ts

@@ -6,23 +6,37 @@ import {
   Menu,
   net,
   protocol,
+  screen,
   session,
+  shell,
   type IpcMainInvokeEvent
 } from "electron";
-import { access, readFile, writeFile } from "node:fs/promises";
+import {
+  access,
+  mkdir,
+  writeFile
+} from "node:fs/promises";
 import path from "node:path";
 import { fileURLToPath, pathToFileURL } from "node:url";
 import {
   createApplicationService,
+  MAXIMUM_MARKDOWN_LENGTH,
   type ApplicationService
 } from "@md-to-pdf/application";
 import {
+  DESKTOP_CONSUME_PENDING_MARKDOWN,
+  DESKTOP_DISCARD_PENDING_MARKDOWN,
   DESKTOP_GET_THEME_CSS,
   DESKTOP_GENERATE_PDF,
   DESKTOP_LIST_THEMES,
+  DESKTOP_MARKDOWN_OPENED,
   DESKTOP_OPEN_MARKDOWN,
+  DESKTOP_OPEN_THEME_DIRECTORY,
+  DESKTOP_REFRESH_THEMES,
   DESKTOP_RENDER_MARKDOWN,
-  DESKTOP_SAVE_PDF
+  DESKTOP_SAVE_MARKDOWN,
+  DESKTOP_SAVE_PDF,
+  DESKTOP_START_NEW_MARKDOWN
 } from "./channels.js";
 import {
   parseMarkdownRenderRequest,
@@ -34,11 +48,36 @@ import {
   ElectronPdfGenerator
 } from "./electron-pdf-generator.js";
 import { parsePagedDocumentPayload } from "./pdf-contract.js";
+import {
+  findMarkdownFileArgument,
+  isMarkdownFilePath,
+  readMarkdownDocument,
+  type OpenedMarkdownDocument
+} from "./markdown-file.js";
+import {
+  loadWindowState,
+  resolveWindowBounds,
+  saveWindowState,
+  type WindowState
+} from "./window-state.js";
 
 const APP_SCHEME = "mdpdf";
 const APP_HOST = "bundle";
 const THEME_HOST = "theme";
 const currentDirectory = path.dirname(fileURLToPath(import.meta.url));
+const DEFAULT_WINDOW_SIZE = { width: 1440, height: 960 };
+const MINIMUM_WINDOW_SIZE = { width: 1024, height: 720 };
+let applicationController:
+  | {
+      window: BrowserWindow;
+      openMarkdownFile(filePath: string): Promise<void>;
+      flushWindowState(): Promise<void>;
+    }
+  | undefined;
+let pendingExternalMarkdownPath = findMarkdownFileArgument(
+  process.argv,
+  process.cwd()
+);
 
 protocol.registerSchemesAsPrivileged([
   {
@@ -91,15 +130,44 @@ function encodeThemeAssetPath(assetPath: string) {
     .join("/");
 }
 
+function focusApplicationWindow() {
+  const window = applicationController?.window;
+  if (!window || window.isDestroyed()) {
+    return;
+  }
+  if (window.isMinimized()) {
+    window.restore();
+  }
+  window.show();
+  window.focus();
+}
+
+function dispatchExternalMarkdown(filePath: string) {
+  if (!applicationController) {
+    pendingExternalMarkdownPath = filePath;
+    return;
+  }
+  void applicationController.openMarkdownFile(filePath).catch(
+    (error: unknown) => {
+      console.warn("无法打开系统传入的 Markdown 文件", error);
+    }
+  );
+  focusApplicationWindow();
+}
+
+function getDesktopThemeDirectory() {
+  return app.isPackaged
+    ? path.join(app.getPath("userData"), "themes")
+    : path.resolve(currentDirectory, "../../..", ".local", "themes");
+}
+
 function createDesktopApplicationService() {
   const projectRoot = path.resolve(currentDirectory, "../../..");
   return createApplicationService({
     bundledRoot: app.isPackaged
       ? path.join(process.resourcesPath, "themes")
       : path.join(projectRoot, "themes"),
-    localRoot: app.isPackaged
-      ? path.join(app.getPath("userData"), "themes")
-      : path.join(projectRoot, ".local", "themes"),
+    localRoot: getDesktopThemeDirectory(),
     createAssetUrl: (themeId, assetPath) =>
       `${APP_SCHEME}://${THEME_HOST}/${encodeURIComponent(themeId)}/${encodeThemeAssetPath(assetPath)}`,
     onWarning: (message) => console.warn(message)
@@ -204,14 +272,26 @@ async function createApplication(
     "/preview-frame.html?target=pdf",
     applicationUrl
   ).href;
+  const windowStatePath = path.join(
+    app.getPath("userData"),
+    "window-state.json"
+  );
+  const savedWindowState = await loadWindowState(windowStatePath);
+  const primaryWorkArea = screen.getPrimaryDisplay().workArea;
+  const initialBounds = resolveWindowBounds(
+    savedWindowState?.bounds,
+    screen.getAllDisplays().map((display) => display.workArea),
+    primaryWorkArea,
+    DEFAULT_WINDOW_SIZE,
+    MINIMUM_WINDOW_SIZE
+  );
 
   const window = new BrowserWindow({
     title: `Markdown PDF 导出器 v${app.getVersion()}`,
     icon: getApplicationIcon(),
-    width: 1440,
-    height: 960,
-    minWidth: 1024,
-    minHeight: 720,
+    ...initialBounds,
+    minWidth: Math.min(MINIMUM_WINDOW_SIZE.width, initialBounds.width),
+    minHeight: Math.min(MINIMUM_WINDOW_SIZE.height, initialBounds.height),
     autoHideMenuBar: true,
     show: false,
     webPreferences: {
@@ -221,6 +301,55 @@ async function createApplication(
       preload: path.join(currentDirectory, "app-preload.cjs")
     }
   });
+  let saveWindowStateTimer: NodeJS.Timeout | undefined;
+  let pendingWindowStateWrite = Promise.resolve();
+  let latestWindowState: WindowState = {
+    version: 1,
+    bounds: window.getNormalBounds(),
+    maximized: window.isMaximized()
+  };
+  const captureWindowState = () => {
+    if (window.isDestroyed()) {
+      return;
+    }
+    latestWindowState = {
+      version: 1,
+      bounds: window.getNormalBounds(),
+      maximized: window.isMaximized()
+    };
+  };
+  const persistWindowState = () => {
+    const state = structuredClone(latestWindowState);
+    pendingWindowStateWrite = pendingWindowStateWrite
+      .catch(() => undefined)
+      .then(() => saveWindowState(windowStatePath, state))
+      .catch((error: unknown) => {
+        console.warn("无法保存窗口状态", error);
+      });
+    return pendingWindowStateWrite;
+  };
+  const scheduleWindowStateSave = () => {
+    captureWindowState();
+    if (saveWindowStateTimer) {
+      clearTimeout(saveWindowStateTimer);
+    }
+    saveWindowStateTimer = setTimeout(() => {
+      saveWindowStateTimer = undefined;
+      void persistWindowState();
+    }, 2_000);
+  };
+  const flushWindowState = async () => {
+    if (saveWindowStateTimer) {
+      clearTimeout(saveWindowStateTimer);
+      saveWindowStateTimer = undefined;
+    }
+    captureWindowState();
+    await persistWindowState();
+  };
+  window.on("move", scheduleWindowStateSave);
+  window.on("resize", scheduleWindowStateSave);
+  window.on("maximize", scheduleWindowStateSave);
+  window.on("unmaximize", scheduleWindowStateSave);
   lockDownWindow(window, new URL(applicationUrl).origin);
 
   const pdfGenerator = new ElectronPdfGenerator({
@@ -233,6 +362,24 @@ async function createApplication(
     new URL(event.senderFrame.url).origin ===
       new URL(applicationUrl).origin;
   let documentRoot: string | undefined;
+  let currentMarkdownPath: string | undefined;
+  let pendingOpenedMarkdown:
+    | {
+        document: OpenedMarkdownDocument;
+        filePath: string;
+      }
+    | undefined;
+  const queueOpenedMarkdown = async (filePath: string) => {
+    const opened = await readMarkdownDocument(
+      filePath,
+      MAXIMUM_MARKDOWN_LENGTH
+    );
+    pendingOpenedMarkdown = {
+      document: opened,
+      filePath
+    };
+    window.webContents.send(DESKTOP_MARKDOWN_OPENED);
+  };
 
   ipcMain.handle(DESKTOP_OPEN_MARKDOWN, async (event) => {
     if (!validateSender(event)) {
@@ -242,20 +389,116 @@ async function createApplication(
       title: "打开 Markdown",
       properties: ["openFile"],
       filters: [
-        { name: "Markdown 文件", extensions: ["md", "markdown"] },
-        { name: "文本文件", extensions: ["txt"] }
+        { name: "Markdown 文件", extensions: ["md", "markdown"] }
       ]
     });
     const filePath = selection.filePaths[0];
     if (selection.canceled || !filePath) {
       return undefined;
     }
-    const content = await readFile(filePath, "utf8");
+    const opened = await readMarkdownDocument(
+      filePath,
+      MAXIMUM_MARKDOWN_LENGTH
+    );
     documentRoot = path.dirname(filePath);
-    return {
-      markdown: content,
-      fileName: path.basename(filePath)
-    };
+    currentMarkdownPath = filePath;
+    return opened;
+  });
+  ipcMain.handle(DESKTOP_CONSUME_PENDING_MARKDOWN, async (event) => {
+    if (!validateSender(event)) {
+      throw new Error("拒绝未授权的桌面文件请求");
+    }
+    const pending = pendingOpenedMarkdown;
+    pendingOpenedMarkdown = undefined;
+    if (!pending) {
+      return undefined;
+    }
+    currentMarkdownPath = pending.filePath;
+    documentRoot = path.dirname(pending.filePath);
+    return pending.document;
+  });
+  ipcMain.handle(DESKTOP_DISCARD_PENDING_MARKDOWN, async (event) => {
+    if (!validateSender(event)) {
+      throw new Error("拒绝未授权的桌面文件请求");
+    }
+    pendingOpenedMarkdown = undefined;
+  });
+  ipcMain.handle(DESKTOP_START_NEW_MARKDOWN, async (event) => {
+    if (!validateSender(event)) {
+      throw new Error("拒绝未授权的桌面文件请求");
+    }
+    currentMarkdownPath = undefined;
+    documentRoot = undefined;
+    pendingOpenedMarkdown = undefined;
+  });
+  ipcMain.handle(
+    DESKTOP_SAVE_MARKDOWN,
+    async (
+      event,
+      unsafeFileName: unknown,
+      unsafeMarkdown: unknown
+    ) => {
+      if (!validateSender(event)) {
+        throw new Error("拒绝未授权的桌面文件请求");
+      }
+      if (
+        typeof unsafeFileName !== "string" ||
+        unsafeFileName.length === 0 ||
+        unsafeFileName.length > 500 ||
+        typeof unsafeMarkdown !== "string" ||
+        unsafeMarkdown.length > MAXIMUM_MARKDOWN_LENGTH
+      ) {
+        throw new Error("Markdown 保存参数无效");
+      }
+
+      let targetPath = currentMarkdownPath;
+      if (!targetPath) {
+        const suggestedName = /\.(?:md|markdown)$/iu.test(
+          path.basename(unsafeFileName)
+        )
+          ? path.basename(unsafeFileName)
+          : `${path.basename(unsafeFileName)}.md`;
+        const selection = await dialog.showSaveDialog(window, {
+          title: "保存 Markdown",
+          defaultPath: path.join(
+            app.getPath("documents"),
+            suggestedName
+          ),
+          filters: [
+            { name: "Markdown 文件", extensions: ["md", "markdown"] }
+          ]
+        });
+        if (selection.canceled || !selection.filePath) {
+          return undefined;
+        }
+        targetPath = /\.(?:md|markdown)$/iu.test(selection.filePath)
+          ? selection.filePath
+          : `${selection.filePath}.md`;
+      }
+
+      await writeFile(targetPath, unsafeMarkdown, "utf8");
+      currentMarkdownPath = targetPath;
+      documentRoot = path.dirname(targetPath);
+      return { fileName: path.basename(targetPath) };
+    }
+  );
+  ipcMain.handle(DESKTOP_OPEN_THEME_DIRECTORY, async (event) => {
+    if (!validateSender(event)) {
+      throw new Error("拒绝未授权的桌面主题请求");
+    }
+    const themeDirectory = getDesktopThemeDirectory();
+    await mkdir(themeDirectory, { recursive: true });
+    const errorMessage = await shell.openPath(themeDirectory);
+    if (errorMessage) {
+      throw new Error(`无法打开自定义主题目录：${errorMessage}`);
+    }
+    return themeDirectory;
+  });
+  ipcMain.handle(DESKTOP_REFRESH_THEMES, async (event) => {
+    if (!validateSender(event)) {
+      throw new Error("拒绝未授权的桌面主题请求");
+    }
+    applicationService.invalidateThemes();
   });
   ipcMain.handle(
     DESKTOP_RENDER_MARKDOWN,
@@ -343,9 +586,23 @@ async function createApplication(
     }
   );
 
-  window.once("ready-to-show", () => window.show());
+  window.once("ready-to-show", () => {
+    if (savedWindowState?.maximized) {
+      window.maximize();
+    }
+    window.show();
+  });
+  window.on("close", () => {
+    void flushWindowState();
+  });
   window.on("closed", () => {
     ipcMain.removeHandler(DESKTOP_OPEN_MARKDOWN);
+    ipcMain.removeHandler(DESKTOP_CONSUME_PENDING_MARKDOWN);
+    ipcMain.removeHandler(DESKTOP_DISCARD_PENDING_MARKDOWN);
+    ipcMain.removeHandler(DESKTOP_START_NEW_MARKDOWN);
+    ipcMain.removeHandler(DESKTOP_SAVE_MARKDOWN);
+    ipcMain.removeHandler(DESKTOP_OPEN_THEME_DIRECTORY);
+    ipcMain.removeHandler(DESKTOP_REFRESH_THEMES);
     ipcMain.removeHandler(DESKTOP_RENDER_MARKDOWN);
     ipcMain.removeHandler(DESKTOP_LIST_THEMES);
     ipcMain.removeHandler(DESKTOP_GET_THEME_CSS);
@@ -354,23 +611,71 @@ async function createApplication(
     void pdfGenerator.close();
   });
   await window.loadURL(applicationUrl);
+  return {
+    window,
+    openMarkdownFile: queueOpenedMarkdown,
+    flushWindowState
+  };
 }
 
-app
-  .whenReady()
-  .then(async () => {
-    Menu.setApplicationMenu(null);
-    if (process.platform === "win32") {
-      app.setAppUserModelId("com.md-to-pdf.desktop");
+const hasSingleInstanceLock = app.requestSingleInstanceLock();
+let windowStateReadyToQuit = false;
+
+if (!hasSingleInstanceLock) {
+  app.quit();
+} else {
+  app.on("second-instance", (_event, arguments_, workingDirectory) => {
+    const filePath = findMarkdownFileArgument(
+      arguments_,
+      workingDirectory
+    );
+    if (filePath) {
+      dispatchExternalMarkdown(filePath);
+    } else {
+      focusApplicationWindow();
     }
-    const applicationService = createDesktopApplicationService();
-    await registerApplicationProtocol(applicationService);
-    await createApplication(applicationService);
-  })
-  .catch((error: unknown) => {
-    console.error("桌面应用启动失败", error);
-    app.quit();
   });
+  app.on("open-file", (event, filePath) => {
+    event.preventDefault();
+    if (isMarkdownFilePath(filePath)) {
+      dispatchExternalMarkdown(filePath);
+    }
+  });
+  app.on("before-quit", (event) => {
+    if (windowStateReadyToQuit || !applicationController) {
+      return;
+    }
+    event.preventDefault();
+    void applicationController.flushWindowState().finally(() => {
+      windowStateReadyToQuit = true;
+      app.quit();
+    });
+  });
+  app
+    .whenReady()
+    .then(async () => {
+      Menu.setApplicationMenu(null);
+      if (process.platform === "win32") {
+        app.setAppUserModelId("com.md-to-pdf.desktop");
+      }
+      await mkdir(getDesktopThemeDirectory(), { recursive: true });
+      const applicationService = createDesktopApplicationService();
+      await registerApplicationProtocol(applicationService);
+      applicationController =
+        await createApplication(applicationService);
+      const startupMarkdownPath = pendingExternalMarkdownPath;
+      pendingExternalMarkdownPath = undefined;
+      if (startupMarkdownPath) {
+        await applicationController.openMarkdownFile(
+          startupMarkdownPath
+        );
+      }
+    })
+    .catch((error: unknown) => {
+      console.error("桌面应用启动失败", error);
+      app.quit();
+    });
+}
 
 app.on("window-all-closed", () => {
   if (process.platform !== "darwin") {

apps/desktop/src/markdown-file.ts

@@ -0,0 +1,60 @@
+import { readFile, stat } from "node:fs/promises";
+import path from "node:path";
+
+const markdownExtensions = new Set([".md", ".markdown"]);
+
+export interface OpenedMarkdownDocument {
+  markdown: string;
+  fileName: string;
+}
+
+export function isMarkdownFilePath(filePath: string) {
+  return markdownExtensions.has(path.extname(filePath).toLowerCase());
+}
+
+export function findMarkdownFileArgument(
+  arguments_: string[],
+  workingDirectory: string
+) {
+  for (const argument of arguments_) {
+    if (!argument || argument.startsWith("-")) {
+      continue;
+    }
+    const candidate = path.isAbsolute(argument)
+      ? path.normalize(argument)
+      : path.resolve(workingDirectory, argument);
+    if (isMarkdownFilePath(candidate)) {
+      return candidate;
+    }
+  }
+  return undefined;
+}
+
+export async function readMarkdownDocument(
+  filePath: string,
+  maximumLength: number
+): Promise<OpenedMarkdownDocument> {
+  if (!isMarkdownFilePath(filePath)) {
+    throw new Error("只允许打开 .md 或 .markdown 文件");
+  }
+  if (!Number.isSafeInteger(maximumLength) || maximumLength <= 0) {
+    throw new Error("Markdown 长度限制无效");
+  }
+
+  const fileStats = await stat(filePath);
+  if (!fileStats.isFile()) {
+    throw new Error("Markdown 路径不是文件");
+  }
+  if (fileStats.size > maximumLength * 4) {
+    throw new Error("Markdown 文件过大");
+  }
+
+  const markdown = await readFile(filePath, "utf8");
+  if (markdown.length > maximumLength) {
+    throw new Error("Markdown 文件过大");
+  }
+  return {
+    markdown,
+    fileName: path.basename(filePath)
+  };
+}

apps/desktop/src/window-state.ts

@@ -0,0 +1,200 @@
+import {
+  mkdir,
+  readFile,
+  rename,
+  rm,
+  writeFile
+} from "node:fs/promises";
+import path from "node:path";
+
+export interface WindowBounds {
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+}
+
+export interface WindowState {
+  version: 1;
+  bounds: WindowBounds;
+  maximized: boolean;
+}
+
+export interface WindowSize {
+  width: number;
+  height: number;
+}
+
+const WINDOW_STATE_VERSION = 1;
+
+function isFiniteNumber(value: unknown): value is number {
+  return typeof value === "number" && Number.isFinite(value);
+}
+
+function parseWindowBounds(value: unknown): WindowBounds | undefined {
+  if (!value || typeof value !== "object") {
+    return undefined;
+  }
+  const bounds = value as Partial<WindowBounds>;
+  if (
+    !isFiniteNumber(bounds.x) ||
+    !isFiniteNumber(bounds.y) ||
+    !isFiniteNumber(bounds.width) ||
+    !isFiniteNumber(bounds.height) ||
+    bounds.width <= 0 ||
+    bounds.height <= 0
+  ) {
+    return undefined;
+  }
+  return {
+    x: Math.round(bounds.x),
+    y: Math.round(bounds.y),
+    width: Math.round(bounds.width),
+    height: Math.round(bounds.height)
+  };
+}
+
+export function parseWindowState(value: unknown): WindowState | undefined {
+  if (!value || typeof value !== "object") {
+    return undefined;
+  }
+  const state = value as Partial<WindowState>;
+  const bounds = parseWindowBounds(state.bounds);
+  if (
+    state.version !== WINDOW_STATE_VERSION ||
+    !bounds ||
+    typeof state.maximized !== "boolean"
+  ) {
+    return undefined;
+  }
+  return {
+    version: WINDOW_STATE_VERSION,
+    bounds,
+    maximized: state.maximized
+  };
+}
+
+function intersectionArea(left: WindowBounds, right: WindowBounds) {
+  const width = Math.max(
+    0,
+    Math.min(left.x + left.width, right.x + right.width) -
+      Math.max(left.x, right.x)
+  );
+  const height = Math.max(
+    0,
+    Math.min(left.y + left.height, right.y + right.height) -
+      Math.max(left.y, right.y)
+  );
+  return width * height;
+}
+
+function clamp(value: number, minimum: number, maximum: number) {
+  return Math.min(Math.max(value, minimum), maximum);
+}
+
+function centerBounds(size: WindowSize, workArea: WindowBounds): WindowBounds {
+  const width = Math.min(
+    Math.max(1, Math.round(size.width)),
+    workArea.width
+  );
+  const height = Math.min(
+    Math.max(1, Math.round(size.height)),
+    workArea.height
+  );
+  return {
+    x: Math.round(workArea.x + (workArea.width - width) / 2),
+    y: Math.round(workArea.y + (workArea.height - height) / 2),
+    width,
+    height
+  };
+}
+
+export function resolveWindowBounds(
+  savedBounds: WindowBounds | undefined,
+  workAreas: WindowBounds[],
+  primaryWorkArea: WindowBounds,
+  defaultSize: WindowSize,
+  minimumSize: WindowSize
+): WindowBounds {
+  if (!savedBounds) {
+    return centerBounds(defaultSize, primaryWorkArea);
+  }
+
+  let selectedArea = primaryWorkArea;
+  let selectedIntersection = 0;
+  for (const workArea of workAreas) {
+    const area = intersectionArea(savedBounds, workArea);
+    if (area > selectedIntersection) {
+      selectedArea = workArea;
+      selectedIntersection = area;
+    }
+  }
+
+  if (selectedIntersection === 0) {
+    return centerBounds(
+      {
+        width: Math.min(
+          Math.max(savedBounds.width, minimumSize.width),
+          primaryWorkArea.width
+        ),
+        height: Math.min(
+          Math.max(savedBounds.height, minimumSize.height),
+          primaryWorkArea.height
+        )
+      },
+      primaryWorkArea
+    );
+  }
+
+  const width = Math.min(
+    Math.max(savedBounds.width, minimumSize.width),
+    selectedArea.width
+  );
+  const height = Math.min(
+    Math.max(savedBounds.height, minimumSize.height),
+    selectedArea.height
+  );
+  return {
+    x: clamp(
+      savedBounds.x,
+      selectedArea.x,
+      selectedArea.x + selectedArea.width - width
+    ),
+    y: clamp(
+      savedBounds.y,
+      selectedArea.y,
+      selectedArea.y + selectedArea.height - height
+    ),
+    width,
+    height
+  };
+}
+
+export async function loadWindowState(filePath: string) {
+  try {
+    return parseWindowState(
+      JSON.parse(await readFile(filePath, "utf8")) as unknown
+    );
+  } catch {
+    return undefined;
+  }
+}
+
+export async function saveWindowState(
+  filePath: string,
+  state: WindowState
+) {
+  await mkdir(path.dirname(filePath), { recursive: true });
+  const temporaryPath = `${filePath}.${process.pid}.tmp`;
+  try {
+    await writeFile(
+      temporaryPath,
+      `${JSON.stringify(state, null, 2)}\n`,
+      "utf8"
+    );
+    await rename(temporaryPath, filePath);
+  } catch (error) {
+    await rm(temporaryPath, { force: true }).catch(() => undefined);
+    throw error;
+  }
+}

apps/desktop/tests/markdown-file.test.ts

@@ -0,0 +1,75 @@
+import { mkdtemp, rm, writeFile } from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import {
+  findMarkdownFileArgument,
+  isMarkdownFilePath,
+  readMarkdownDocument
+} from "../src/markdown-file.js";
+
+describe("桌面 Markdown 文件参数", () => {
+  it("识别两种 Markdown 扩展名且忽略大小写", () => {
+    expect(isMarkdownFilePath("C:\\docs\\周报.md")).toBe(true);
+    expect(isMarkdownFilePath("C:\\docs\\说明.MARKDOWN")).toBe(true);
+    expect(isMarkdownFilePath("C:\\docs\\说明.txt")).toBe(false);
+  });
+
+  it("从启动参数中提取绝对 Markdown 路径", () => {
+    expect(
+      findMarkdownFileArgument(
+        [
+          "C:\\Program Files\\md-to-pdf\\md-to-pdf.exe",
+          "--original-process-start-time=1",
+          "D:\\文档\\项目周报.md"
+        ],
+        "C:\\Windows"
+      )
+    ).toBe(path.normalize("D:\\文档\\项目周报.md"));
+  });
+
+  it("根据第二实例的工作目录解析相对路径", () => {
+    expect(
+      findMarkdownFileArgument(
+        ["md-to-pdf.exe", "docs\\readme.markdown"],
+        "D:\\项目"
+      )
+    ).toBe(path.resolve("D:\\项目", "docs\\readme.markdown"));
+  });
+
+  it("忽略非 Markdown 文件及 Chromium 参数", () => {
+    expect(
+      findMarkdownFileArgument(
+        ["md-to-pdf.exe", "--inspect", "notes.txt"],
+        "C:\\项目"
+      )
+    ).toBeUndefined();
+  });
+
+  it("统一读取 Markdown 并限制解码后的字符数", async () => {
+    const directory = await mkdtemp(
+      path.join(os.tmpdir(), "md-to-pdf-markdown-")
+    );
+    const filePath = path.join(directory, "示例.md");
+    try {
+      await writeFile(filePath, "# 示例", "utf8");
+      await expect(
+        readMarkdownDocument(filePath, 20)
+      ).resolves.toEqual({
+        markdown: "# 示例",
+        fileName: "示例.md"
+      });
+      await expect(
+        readMarkdownDocument(filePath, 2)
+      ).rejects.toThrow("Markdown 文件过大");
+    } finally {
+      await rm(directory, { recursive: true, force: true });
+    }
+  });
+
+  it("拒绝非 Markdown 扩展名", async () => {
+    await expect(
+      readMarkdownDocument("C:\\docs\\说明.txt", 100)
+    ).rejects.toThrow("只允许打开 .md 或 .markdown 文件");
+  });
+});

apps/desktop/tests/window-state.test.ts

@@ -0,0 +1,165 @@
+import { mkdtemp, readdir, rm } from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import {
+  loadWindowState,
+  parseWindowState,
+  resolveWindowBounds,
+  saveWindowState
+} from "../src/window-state.js";
+
+const primaryWorkArea = {
+  x: 0,
+  y: 0,
+  width: 1920,
+  height: 1040
+};
+const defaultSize = { width: 1440, height: 960 };
+const minimumSize = { width: 1024, height: 720 };
+
+describe("桌面窗口状态", () => {
+  it("校验并规范化持久化状态", () => {
+    expect(
+      parseWindowState({
+        version: 1,
+        bounds: {
+          x: 120.4,
+          y: 80.6,
+          width: 1280.2,
+          height: 800.8
+        },
+        maximized: true
+      })
+    ).toEqual({
+      version: 1,
+      bounds: {
+        x: 120,
+        y: 81,
+        width: 1280,
+        height: 801
+      },
+      maximized: true
+    });
+  });
+
+  it("拒绝损坏或不受支持的状态", () => {
+    expect(parseWindowState(undefined)).toBeUndefined();
+    expect(
+      parseWindowState({
+        version: 2,
+        bounds: primaryWorkArea,
+        maximized: false
+      })
+    ).toBeUndefined();
+    expect(
+      parseWindowState({
+        version: 1,
+        bounds: { x: 0, y: 0, width: -1, height: 720 },
+        maximized: false
+      })
+    ).toBeUndefined();
+  });
+
+  it("首次启动时在主显示器居中", () => {
+    expect(
+      resolveWindowBounds(
+        undefined,
+        [primaryWorkArea],
+        primaryWorkArea,
+        defaultSize,
+        minimumSize
+      )
+    ).toEqual({
+      x: 240,
+      y: 40,
+      width: 1440,
+      height: 960
+    });
+  });
+
+  it("将部分溢出的窗口完整收回原显示器", () => {
+    expect(
+      resolveWindowBounds(
+        { x: 1700, y: 900, width: 1280, height: 800 },
+        [primaryWorkArea],
+        primaryWorkArea,
+        defaultSize,
+        minimumSize
+      )
+    ).toEqual({
+      x: 640,
+      y: 240,
+      width: 1280,
+      height: 800
+    });
+  });
+
+  it("显示器移除后在主显示器居中恢复", () => {
+    expect(
+      resolveWindowBounds(
+        { x: 3000, y: 120, width: 1200, height: 780 },
+        [primaryWorkArea],
+        primaryWorkArea,
+        defaultSize,
+        minimumSize
+      )
+    ).toEqual({
+      x: 360,
+      y: 130,
+      width: 1200,
+      height: 780
+    });
+  });
+
+  it("窗口大于工作区时缩小到可完整展示", () => {
+    const compactWorkArea = {
+      x: 1920,
+      y: 0,
+      width: 1280,
+      height: 680
+    };
+    expect(
+      resolveWindowBounds(
+        { x: 2000, y: -100, width: 1800, height: 1000 },
+        [primaryWorkArea, compactWorkArea],
+        primaryWorkArea,
+        defaultSize,
+        minimumSize
+      )
+    ).toEqual({
+      x: 1920,
+      y: 0,
+      width: 1280,
+      height: 680
+    });
+  });
+
+  it("通过临时文件原子保存并可重新载入", async () => {
+    const directory = await mkdtemp(
+      path.join(os.tmpdir(), "md-to-pdf-window-")
+    );
+    const filePath = path.join(directory, "window-state.json");
+    const state = {
+      version: 1 as const,
+      bounds: { x: 10, y: 20, width: 1200, height: 800 },
+      maximized: false
+    };
+    try {
+      await saveWindowState(filePath, state);
+      await expect(loadWindowState(filePath)).resolves.toEqual(state);
+      const updatedState = {
+        ...state,
+        bounds: { x: 30, y: 40, width: 1280, height: 900 },
+        maximized: true
+      };
+      await saveWindowState(filePath, updatedState);
+      await expect(loadWindowState(filePath)).resolves.toEqual(
+        updatedState
+      );
+      expect(await readdir(directory)).toEqual(["window-state.json"]);
+    } finally {
+      await rm(directory, { recursive: true, force: true });
+    }
+  });
+});

apps/web/src/App.tsx

@@ -49,12 +49,15 @@ import {
 } from "./preview-zoom";
 import { useMarkdownRender } from "./use-markdown-render";
 import {
-  type MarkdownImageResource
-} from "./application-backend";
+  createMarkdownFileName,
+  downloadMarkdown,
+  ensureMarkdownFileName
+} from "./document-file";
 import {
   type ThemeSummary,
   useThemeResources
 } from "./use-theme-resources";
+import { sampleMarkdown } from "./sample-markdown";
 
 const PrecisePdfPreview = lazy(async () => {
   const module = await import("./PrecisePdfPreview");
@@ -62,336 +65,20 @@ const PrecisePdfPreview = lazy(async () => {
 });
 
 type PreviewMode = "quick" | "precise";
-const imageFilePattern = /\.(?:avif|gif|jpe?g|png|svg|webp)$/iu;
-
-function bytesToBase64(bytes: Uint8Array) {
-  const parts: string[] = [];
-  const chunkSize = 32_768;
-  for (let offset = 0; offset < bytes.length; offset += chunkSize) {
-    parts.push(
-      String.fromCharCode(...bytes.subarray(offset, offset + chunkSize))
-    );
-  }
-  return window.btoa(parts.join(""));
-}
-
-async function readImageResources(files: FileList) {
-  const images = Array.from(files).filter((file) =>
-    imageFilePattern.test(file.name)
-  );
-  return Promise.all(
-    images.map(async (file): Promise<MarkdownImageResource> => ({
-      path: file.webkitRelativePath || file.name,
-      data: bytesToBase64(new Uint8Array(await file.arrayBuffer()))
-    }))
-  );
-}
-
-const sampleMarkdown = `---
-title: Markdown PDF 示例
-author: 内网文档团队
-keywords:
-  - Markdown
-  - PDF
----
-
-# Markdown PDF 示例
-
-这是一份使用 **Typora 风格主题** 渲染的预览文档。
-
-## 常用内容
-
-- [x] Markdown 实时预览
-- [x] 表格与任务列表
-- [x] 数学公式、Mermaid 与 ECharts
-- [ ] Chromium PDF 导出
-
-| 功能 | 当前状态 |
-| --- | --- |
-| HTML 预览 | 已实现 |
-| PDF 下载 | 下一阶段 |
-
-行内公式：$E = mc^2$
-
-## 网络图片
-
-### 中等尺寸
-
-![NASA 地球中等尺寸示例](https://images-assets.nasa.gov/image/PIA18033/PIA18033~medium.jpg)
-
-### 超高尺寸
-
-下图用于验证图片高度超过单页内容区时，会等比例缩放并作为完整块放置，
-不会跨页切割。
-
-![超高网络图片分页示例](https://images.unsplash.com/photo-1500530855697-b586d89ba3ee?w=1200&q=80)
-
-\`\`\`mermaid
-flowchart LR
-  A["Markdown"] --> B["统一 HTML"]
-  B --> C["主题 CSS"]
-  C --> D["网页预览"]
-  C --> E["PDF 导出"]
-\`\`\`
-
-## ECharts 图表
-
-### 基础柱状图
-
-\`\`\`echarts
-caption: 各模块文档数量
-height: 58mm
-option:
-  xAxis:
-    type: category
-    data: [研发, 产品, 设计, 运营]
-  yAxis:
-    type: value
-  series:
-    - type: bar
-      data: [28, 18, 15, 22]
-\`\`\`
-
-### Tree 树图
-
-\`\`\`echarts
-caption: 产品能力树
-height: 58mm
-option:
-  series:
-    - type: tree
-      orient: LR
-      label:
-        position: left
-      data:
-        - name: 文档平台
-          children:
-            - name: Markdown
-              children:
-                - name: Mermaid
-                - name: ECharts
-            - name: PDF
-              children:
-                - name: 快速预览
-                - name: 精确预览
-\`\`\`
-
-### Treemap 矩形树图
-
-\`\`\`echarts
-caption: 模块工作量占比
-height: 58mm
-option:
-  series:
-    - type: treemap
-      roam: false
-      nodeClick: false
-      breadcrumb:
-        show: false
-      label:
-        show: true
-        formatter: "{b}"
-        color: "#1f2937"
-        fontWeight: bold
-        backgroundColor: "rgba(255, 255, 255, 0.88)"
-        borderRadius: 3
-        padding: [3, 6]
-      itemStyle:
-        borderColor: "#ffffff"
-        borderWidth: 2
-        gapWidth: 2
-      levels:
-        - itemStyle:
-            borderWidth: 0
-            gapWidth: 2
-        - upperLabel:
-            show: true
-            height: 28
-            color: "#1f2937"
-            fontWeight: bold
-            backgroundColor: "rgba(255, 255, 255, 0.88)"
-            padding: [3, 6]
-          itemStyle:
-            borderColor: "#ffffff"
-            borderWidth: 2
-            gapWidth: 2
-        - label:
-            show: true
-            formatter: "{b}"
-            color: "#1f2937"
-            fontWeight: bold
-            backgroundColor: "rgba(255, 255, 255, 0.88)"
-            borderRadius: 3
-            padding: [3, 6]
-          itemStyle:
-            borderColor: "#ffffff"
-            borderWidth: 2
-            gapWidth: 2
-      data:
-        - name: 渲染
-          children:
-            - { name: Markdown, value: 32 }
-            - { name: ECharts, value: 24 }
-            - { name: Mermaid, value: 18 }
-        - name: 导出
-          children:
-            - { name: PDF, value: 28 }
-            - { name: 主题, value: 12 }
-\`\`\`
-
-### Sunburst 旭日图
-
-\`\`\`echarts
-caption: 文档内容层级
-height: 58mm
-option:
-  series:
-    - type: sunburst
-      radius: [15%, 90%]
-      data:
-        - name: 技术文档
-          children:
-            - { name: 架构, value: 18 }
-            - { name: 接口, value: 24 }
-        - name: 项目文档
-          children:
-            - { name: 周报, value: 16 }
-            - { name: 计划, value: 12 }
-\`\`\`
-
-### Graph 关系图
-
-\`\`\`echarts
-caption: 渲染链路关系
-height: 58mm
-option:
-  series:
-    - type: graph
-      layout: circular
-      roam: false
-      label:
-        show: true
-      data:
-        - { name: Markdown, symbolSize: 42 }
-        - { name: HTML, symbolSize: 38 }
-        - { name: 预览, symbolSize: 34 }
-        - { name: PDF, symbolSize: 34 }
-      links:
-        - { source: Markdown, target: HTML }
-        - { source: HTML, target: 预览 }
-        - { source: HTML, target: PDF }
-\`\`\`
-
-### Sankey 桑基图
-
-\`\`\`echarts
-caption: 文档流转量
-height: 58mm
-option:
-  series:
-    - type: sankey
-      data:
-        - { name: Markdown }
-        - { name: HTML }
-        - { name: 快速预览 }
-        - { name: 精确预览 }
-        - { name: PDF }
-      links:
-        - { source: Markdown, target: HTML, value: 100 }
-        - { source: HTML, target: 快速预览, value: 55 }
-        - { source: HTML, target: 精确预览, value: 25 }
-        - { source: HTML, target: PDF, value: 20 }
-\`\`\`
-
-### Chord 和弦图
-
-\`\`\`echarts
-caption: 团队协作关系
-height: 58mm
-option:
-  series:
-    - type: chord
-      label:
-        show: true
-      data:
-        - { name: 研发 }
-        - { name: 产品 }
-        - { name: 设计 }
-        - { name: 运营 }
-      links:
-        - { source: 研发, target: 产品, value: 12 }
-        - { source: 产品, target: 设计, value: 8 }
-        - { source: 设计, target: 运营, value: 6 }
-        - { source: 运营, target: 研发, value: 4 }
-\`\`\`
-
-### Funnel 漏斗图
-
-\`\`\`echarts
-caption: 文档发布转化
-height: 58mm
-option:
-  series:
-    - type: funnel
-      sort: descending
-      label:
-        formatter: "{b}: {c}"
-      data:
-        - { name: 草稿, value: 100 }
-        - { name: 评审, value: 76 }
-        - { name: 定稿, value: 58 }
-        - { name: 发布, value: 45 }
-\`\`\`
-
-### Gauge 仪表盘
-
-\`\`\`echarts
-caption: 发布完成率
-height: 58mm
-option:
-  series:
-    - type: gauge
-      min: 0
-      max: 100
-      progress:
-        show: true
-      detail:
-        formatter: "{value}%"
-      data:
-        - { name: 完成率, value: 78 }
-\`\`\`
-
-### PictorialBar 象形柱图
-
-\`\`\`echarts
-caption: 各渠道文档数量
-height: 58mm
-option:
-  xAxis:
-    type: category
-    data: [知识库, 周报, 手册, 方案]
-  yAxis:
-    type: value
-  series:
-    - type: pictorialBar
-      symbol: "path://M0,10 L5,0 L10,10 Z"
-      symbolRepeat: true
-      symbolSize: [14, 10]
-      data: [12, 20, 16, 24]
-\`\`\`
-
-> 预览和 PDF 将共用同一份 HTML 与 CSS。
-`;
+type DocumentKind = "sample" | "new" | "file";
+const noImageResources: never[] = [];
 
 export function App() {
   const [markdown, setMarkdown] = useState(sampleMarkdown);
   const [fileName, setFileName] = useState("示例文档.md");
-  const [imageResources, setImageResources] = useState<
-    MarkdownImageResource[]
-  >([]);
+  const [documentKind, setDocumentKind] =
+    useState<DocumentKind>("sample");
+  const [savedMarkdown, setSavedMarkdown] = useState(sampleMarkdown);
   const [exportConfig, setExportConfig] =
     useState<ExportConfig>(loadExportConfig);
   const [settingsOpen, setSettingsOpen] = useState(false);
+  const [moreMenuOpen, setMoreMenuOpen] = useState(false);
+  const [themeRefreshKey, setThemeRefreshKey] = useState(0);
   const [sourcePanelCollapsed, setSourcePanelCollapsed] = useState(false);
   const [status, setStatus] = useState("正在准备预览…");
   const [appError, setAppError] = useState("");
@@ -412,6 +99,8 @@ export function App() {
     total: 0
   });
   const editorRef = useRef<HTMLTextAreaElement>(null);
+  const markdownFileInputRef = useRef<HTMLInputElement>(null);
+  const moreMenuRef = useRef<HTMLDivElement>(null);
   const previewScrollRef = useRef<HTMLDivElement>(null);
   const previewFrameRef = useRef<HTMLIFrameElement>(null);
   const previewRequestIdRef = useRef(0);
@@ -421,9 +110,93 @@ export function App() {
   const scrollSyncOriginRef = useRef<
     "editor" | "preview" | undefined
   >(undefined);
+  const documentDirty = markdown !== savedMarkdown;
+  const documentDirtyRef = useRef(documentDirty);
+  const themeRefreshTargetRef = useRef<number | undefined>(undefined);
+  documentDirtyRef.current = documentDirty;
+
+  useEffect(() => {
+    const bridge = window.mdToPdfDesktop;
+    if (!bridge) {
+      return;
+    }
+    let active = true;
+    const consumeOpenedMarkdown = async () => {
+      if (
+        documentDirtyRef.current &&
+        !window.confirm("当前文档有未保存修改，是否放弃并打开其他文件？")
+      ) {
+        try {
+          await bridge.discardPendingMarkdown();
+        } catch (reason) {
+          if (active) {
+            setAppError(
+              reason instanceof Error
+                ? reason.message
+                : "无法丢弃待打开的 Markdown 文件"
+            );
+          }
+        }
+        return;
+      }
+      try {
+        const opened = await bridge.consumePendingMarkdown();
+        if (!active || !opened) {
+          return;
+        }
+        setAppError("");
+        setMarkdown(opened.markdown);
+        setFileName(opened.fileName);
+        setDocumentKind("file");
+        setSavedMarkdown(opened.markdown);
+        setStatus("Markdown 与同目录图片素材已载入");
+      } catch (reason) {
+        if (active) {
+          setAppError(
+            reason instanceof Error
+              ? reason.message
+              : "无法打开 Markdown 文件"
+          );
+        }
+      }
+    };
+    const removeListener = bridge.onMarkdownOpened(() => {
+      void consumeOpenedMarkdown();
+    });
+    void consumeOpenedMarkdown();
+    return () => {
+      active = false;
+      removeListener();
+    };
+  }, []);
+
+  useEffect(() => {
+    if (!moreMenuOpen) {
+      return;
+    }
+    const handlePointerDown = (event: PointerEvent) => {
+      if (
+        event.target instanceof Node &&
+        !moreMenuRef.current?.contains(event.target)
+      ) {
+        setMoreMenuOpen(false);
+      }
+    };
+    const handleKeyDown = (event: KeyboardEvent) => {
+      if (event.key === "Escape") {
+        setMoreMenuOpen(false);
+      }
+    };
+    window.addEventListener("pointerdown", handlePointerDown);
+    window.addEventListener("keydown", handleKeyDown);
+    return () => {
+      window.removeEventListener("pointerdown", handlePointerDown);
+      window.removeEventListener("keydown", handleKeyDown);
+    };
+  }, [moreMenuOpen]);
 
   const handleThemesLoaded = useCallback(
-    (availableThemes: ThemeSummary[]) => {
+    (availableThemes: ThemeSummary[], loadedRefreshKey: number) => {
       setExportConfig((currentConfig) => {
         if (
           availableThemes.some(
@@ -440,6 +213,10 @@ export function App() {
           ? { ...currentConfig, themeId: preferredTheme.id }
           : currentConfig;
       });
+      if (themeRefreshTargetRef.current === loadedRefreshKey) {
+        themeRefreshTargetRef.current = undefined;
+        setStatus("主题清单已刷新");
+      }
     },
     []
   );
@@ -450,7 +227,7 @@ export function App() {
   const { error: renderError, result } = useMarkdownRender(
     markdown,
     "zh-CN",
-    imageResources,
+    noImageResources,
     {
       onRenderStart: handleRenderStart,
       onStatusChange: setStatus
@@ -460,7 +237,11 @@ export function App() {
     error: themeError,
     themeCss,
     themes
-  } = useThemeResources(exportConfig.themeId, handleThemesLoaded);
+  } = useThemeResources(
+    exportConfig.themeId,
+    handleThemesLoaded,
+    themeRefreshKey
+  );
   const error =
     renderError ||
     themeError ||
@@ -471,6 +252,13 @@ export function App() {
     pdfError;
   const themeId = exportConfig.themeId;
   const selectedTheme = themes.find((theme) => theme.id === themeId);
+  const effectiveFileName =
+    documentKind === "new" || !fileName
+      ? createMarkdownFileName(markdown)
+      : fileName;
+  const documentDisplayName =
+    documentKind === "new" ? "新建文档" : fileName;
+  const showUnsavedState = documentKind === "new" || documentDirty;
   const paperDimensions = getPaperDimensionsMm(
     exportConfig.paper.format,
     exportConfig.paper.orientation
@@ -501,22 +289,22 @@ export function App() {
       result && themeCss
         ? createPagedDocumentPayload({
             document: result,
-            fileName,
+            fileName: effectiveFileName,
             themeCss,
             exportConfig
           })
         : undefined,
-    [exportConfig, fileName, result, themeCss]
+    [effectiveFileName, exportConfig, result, themeCss]
   );
   const pdfRequest = useMemo<PdfExportRequest>(
     () => ({
       markdown,
-      fileName,
+      fileName: effectiveFileName,
       language: "zh-CN",
-      resources: imageResources,
+      resources: noImageResources,
       exportConfig
     }),
-    [exportConfig, fileName, imageResources, markdown]
+    [effectiveFileName, exportConfig, markdown]
   );
   const pdfCacheKey = useMemo(
     () => createPdfExportCacheKey(pdfRequest),
@@ -848,6 +636,24 @@ export function App() {
     window.requestAnimationFrame(updatePrecisePreviewCurrentPage);
   }, []);
 
+  function confirmDiscardChanges() {
+    return (
+      !documentDirty ||
+      window.confirm("当前文档有未保存修改，是否放弃这些修改？")
+    );
+  }
+
+  function handleOpenMarkdown() {
+    if (!confirmDiscardChanges()) {
+      return;
+    }
+    if (window.mdToPdfDesktop) {
+      void handleDesktopOpenMarkdown();
+      return;
+    }
+    markdownFileInputRef.current?.click();
+  }
+
   async function handleFileChange(event: ChangeEvent<HTMLInputElement>) {
     const file = event.target.files?.[0];
     if (!file) {
@@ -856,10 +662,12 @@ export function App() {
 
     try {
       setAppError("");
-      setMarkdown(await file.text());
+      const content = await file.text();
+      setMarkdown(content);
       setFileName(file.name);
-      setImageResources([]);
-      setStatus("Markdown 已载入；如含相对图片，请添加素材目录");
+      setDocumentKind("file");
+      setSavedMarkdown(content);
+      setStatus("Markdown 已载入；Web 端不读取本地相对图片");
     } catch {
       setAppError("无法读取所选 Markdown 文件");
     } finally {
@@ -867,25 +675,6 @@ export function App() {
     }
   }
 
-  async function handleAssetDirectoryChange(
-    event: ChangeEvent<HTMLInputElement>
-  ) {
-    const files = event.target.files;
-    if (!files?.length) {
-      return;
-    }
-    try {
-      setAppError("");
-      const resources = await readImageResources(files);
-      setImageResources(resources);
-      setStatus(`已载入 ${resources.length} 个图片素材`);
-    } catch {
-      setAppError("无法读取所选图片素材目录");
-    } finally {
-      event.target.value = "";
-    }
-  }
-
   async function handleDesktopOpenMarkdown() {
     try {
       setAppError("");
@@ -895,7 +684,8 @@ export function App() {
       }
       setMarkdown(opened.markdown);
       setFileName(opened.fileName);
-      setImageResources([]);
+      setDocumentKind("file");
+      setSavedMarkdown(opened.markdown);
       setStatus("Markdown 与同目录图片素材已载入");
     } catch (reason) {
       setAppError(
@@ -904,6 +694,91 @@ export function App() {
     }
   }
 
+  async function handleNewMarkdown() {
+    setMoreMenuOpen(false);
+    if (!confirmDiscardChanges()) {
+      return;
+    }
+    try {
+      setAppError("");
+      await window.mdToPdfDesktop?.startNewMarkdown();
+      setMarkdown("");
+      setFileName("");
+      setDocumentKind("new");
+      setSavedMarkdown("");
+      setStatus("新建文档尚未保存，可直接编辑或导出 PDF");
+      window.requestAnimationFrame(() => editorRef.current?.focus());
+    } catch (reason) {
+      setAppError(
+        reason instanceof Error ? reason.message : "无法新建 Markdown"
+      );
+    }
+  }
+
+  async function handleSaveMarkdown() {
+    setMoreMenuOpen(false);
+    const suggestedName = ensureMarkdownFileName(fileName, markdown);
+    try {
+      setAppError("");
+      const bridge = window.mdToPdfDesktop;
+      let savedFileName = suggestedName;
+      if (bridge) {
+        const saved = await bridge.saveMarkdown(suggestedName, markdown);
+        if (!saved) {
+          setStatus("已取消 Markdown 保存");
+          return;
+        }
+        savedFileName = saved.fileName;
+      } else {
+        downloadMarkdown(markdown, suggestedName);
+      }
+      setFileName(savedFileName);
+      setDocumentKind("file");
+      setSavedMarkdown(markdown);
+      setStatus(`Markdown 已保存：${savedFileName}`);
+    } catch (reason) {
+      setAppError(
+        reason instanceof Error ? reason.message : "Markdown 保存失败"
+      );
+    }
+  }
+
+  async function handleOpenThemeDirectory() {
+    setMoreMenuOpen(false);
+    try {
+      setAppError("");
+      const themeDirectory =
+        await window.mdToPdfDesktop?.openThemeDirectory();
+      if (themeDirectory) {
+        setStatus(`自定义主题目录：${themeDirectory}`);
+      }
+    } catch (reason) {
+      setAppError(
+        reason instanceof Error
+          ? reason.message
+          : "无法打开自定义主题目录"
+      );
+    }
+  }
+
+  async function handleRefreshThemes() {
+    setMoreMenuOpen(false);
+    try {
+      setAppError("");
+      await window.mdToPdfDesktop?.refreshThemes();
+      setStatus("正在刷新主题清单…");
+      setThemeRefreshKey((key) => {
+        const nextKey = key + 1;
+        themeRefreshTargetRef.current = nextKey;
+        return nextKey;
+      });
+    } catch (reason) {
+      setAppError(
+        reason instanceof Error ? reason.message : "无法刷新主题清单"
+      );
+    }
+  }
+
   async function generatePdf(download: boolean) {
     if (exportingPdf) {
       return;
@@ -993,7 +868,14 @@ export function App() {
           </div>
           <div className="document-summary">
             <span className="panel-kicker">源文件</span>
-            <strong title={fileName}>{fileName}</strong>
+            <div className="document-name-row">
+              <strong title={documentDisplayName}>
+                {documentDisplayName}
+              </strong>
+              {showUnsavedState ? (
+                <span className="unsaved-badge">未保存</span>
+              ) : null}
+            </div>
             <span
               className={`render-status${error ? " is-error" : ""}`}
               aria-live="polite"
@@ -1004,36 +886,67 @@ export function App() {
           </div>
         </div>
         <div className="topbar-actions">
-          {window.mdToPdfDesktop ? (
+          <button type="button" onClick={handleOpenMarkdown}>
+            打开 Markdown
+          </button>
+          <div className="more-menu" ref={moreMenuRef}>
             <button
               type="button"
-              onClick={() => void handleDesktopOpenMarkdown()}
+              aria-controls="document-actions-menu"
+              aria-expanded={moreMenuOpen}
+              aria-haspopup="menu"
+              onClick={() => setMoreMenuOpen((open) => !open)}
             >
-              打开 Markdown
+              更多 ▾
             </button>
-          ) : (
-            <>
-              <label className="file-button">
-                选择 Markdown
-                <input
-                  type="file"
-                  accept=".md,.markdown,text/markdown,text/plain"
-                  onChange={handleFileChange}
-                />
-              </label>
-              <label className="file-button">
-                添加素材目录
-                <input
-                  type="file"
-                  accept="image/*"
-                  multiple
-                  // React 尚未声明 Chromium 的目录选择属性。
-                  {...({ webkitdirectory: "" } as Record<string, string>)}
-                  onChange={handleAssetDirectoryChange}
-                />
-              </label>
-            </>
-          )}
+            {moreMenuOpen ? (
+              <div
+                id="document-actions-menu"
+                className="more-menu-popover"
+                role="menu"
+              >
+                <button
+                  type="button"
+                  role="menuitem"
+                  onClick={() => void handleNewMarkdown()}
+                >
+                  新建 Markdown
+                </button>
+                <button
+                  type="button"
+                  role="menuitem"
+                  onClick={() => void handleSaveMarkdown()}
+                >
+                  保存 Markdown
+                </button>
+                {window.mdToPdfDesktop ? (
+                  <>
+                    <button
+                      type="button"
+                      role="menuitem"
+                      onClick={() => void handleOpenThemeDirectory()}
+                    >
+                      打开自定义主题目录
+                    </button>
+                    <button
+                      type="button"
+                      role="menuitem"
+                      onClick={() => void handleRefreshThemes()}
+                    >
+                      刷新主题
+                    </button>
+                  </>
+                ) : null}
+              </div>
+            ) : null}
+          </div>
+          <input
+            ref={markdownFileInputRef}
+            hidden
+            type="file"
+            accept=".md,.markdown,text/markdown"
+            onChange={handleFileChange}
+          />
           <button type="button" onClick={() => setSettingsOpen(true)}>
             导出设置
           </button>

apps/web/src/diagram-page-fit.ts

@@ -30,6 +30,58 @@ export interface SvgDiagramFitOptions {
 
 const PAGE_FIT_EPSILON_PX = 1;
 
+function parsePixelValue(value: string) {
+  const parsed = Number.parseFloat(value);
+  return Number.isFinite(parsed) ? parsed : 0;
+}
+
+export function getPrecedingMediaTitleHeight(
+  element: HTMLElement
+) {
+  const title = element.previousElementSibling;
+  if (
+    !(title instanceof HTMLElement) ||
+    !/^H[1-6]$/.test(title.tagName)
+  ) {
+    return 0;
+  }
+
+  const style = getComputedStyle(title);
+  title.style.setProperty("break-after", "avoid-page", "important");
+  title.style.setProperty(
+    "page-break-after",
+    "avoid",
+    "important"
+  );
+  return (
+    title.getBoundingClientRect().height +
+    parsePixelValue(style.marginTop) +
+    parsePixelValue(style.marginBottom)
+  );
+}
+
+export function ensurePageBreakAfter(element: HTMLElement) {
+  const existingMarker = element.nextElementSibling;
+  if (
+    existingMarker instanceof HTMLElement &&
+    existingMarker.dataset.mediaPageBreak === "true"
+  ) {
+    return existingMarker;
+  }
+  const marker = element.ownerDocument.createElement("div");
+  marker.dataset.mediaPageBreak = "true";
+  marker.setAttribute("aria-hidden", "true");
+  marker.style.setProperty("height", "0", "important");
+  marker.style.setProperty("break-before", "page", "important");
+  marker.style.setProperty(
+    "page-break-before",
+    "always",
+    "important"
+  );
+  element.after(marker);
+  return marker;
+}
+
 export function parseSvgViewBox(
   value: string | null
 ): DiagramDimensions | undefined {
@@ -144,9 +196,17 @@ export function fitSvgDiagramsToPage(
       continue;
     }
 
-    const availablePageContent =
+    const resolvedPageContent =
       options.resolvePageContent?.(container, pageContent) ??
       pageContent;
+    const availablePageContent = {
+      width: resolvedPageContent.width,
+      height: Math.max(
+        0,
+        resolvedPageContent.height -
+          getPrecedingMediaTitleHeight(container)
+      )
+    };
     const fit = calculateDiagramPageFit(
       intrinsic,
       availablePageContent
@@ -157,6 +217,13 @@ export function fitSvgDiagramsToPage(
 
     container.dataset.pageHeightFitted = "true";
     container.style.setProperty("margin-block", "0", "important");
+    container.style.setProperty("break-after", "page", "important");
+    container.style.setProperty(
+      "page-break-after",
+      "always",
+      "important"
+    );
+    ensurePageBreakAfter(container);
     if (!svg.getAttribute("viewBox")) {
       svg.setAttribute(
         "viewBox",

apps/web/src/document-file.ts

@@ -0,0 +1,110 @@
+const fallbackBaseName = "未命名文档";
+const windowsReservedName =
+  /^(?:con|prn|aux|nul|com[1-9]|lpt[1-9])$/iu;
+
+function stripMarkdownFormatting(value: string) {
+  return value
+    .replace(/!\[([^\]]*)\]\([^)]*\)/gu, "$1")
+    .replace(/\[([^\]]+)\]\([^)]*\)/gu, "$1")
+    .replace(/<\/?[A-Za-z][^>]*>/gu, " ")
+    .replace(/[`*_~]/gu, "")
+    .replace(/^\s{0,3}(?:>\s*|[-+*]\s+|\d+[.)]\s+)/u, "")
+    .trim();
+}
+
+export function legalizeMarkdownBaseName(value: string) {
+  const normalized = stripMarkdownFormatting(value)
+    .normalize("NFKC")
+    .replace(/[^\p{L}\p{N}\s_-]+/gu, " ")
+    .replace(/\s+/gu, " ")
+    .trim()
+    .replace(/[ .]+$/u, "");
+  const shortened = Array.from(normalized).slice(0, 100).join("").trim();
+  if (!shortened) {
+    return fallbackBaseName;
+  }
+  return windowsReservedName.test(shortened)
+    ? `文档 ${shortened}`
+    : shortened;
+}
+
+export function deriveMarkdownBaseName(markdown: string) {
+  const lines = markdown.replace(/^\uFEFF/u, "").split(/\r?\n/u);
+  let inFrontMatter = lines[0]?.trim() === "---";
+  let inFence = false;
+  let fenceMarker = "";
+  let fenceLength = 0;
+  let firstBodyLine = "";
+
+  for (let index = inFrontMatter ? 1 : 0; index < lines.length; index += 1) {
+    const line = lines[index] ?? "";
+    const trimmed = line.trim();
+    if (inFrontMatter) {
+      if (trimmed === "---" || trimmed === "...") {
+        inFrontMatter = false;
+      }
+      continue;
+    }
+
+    if (inFence) {
+      const closingFence = trimmed.match(/^(`+|~+)\s*$/u)?.[1];
+      if (
+        closingFence?.[0] === fenceMarker &&
+        closingFence.length >= fenceLength
+      ) {
+        inFence = false;
+        fenceMarker = "";
+        fenceLength = 0;
+      }
+      continue;
+    }
+
+    const fence = trimmed.match(/^(`{3,}|~{3,})/u)?.[1];
+    if (fence) {
+      if (!inFence) {
+        inFence = true;
+        fenceMarker = fence[0] ?? "";
+        fenceLength = fence.length;
+      }
+      continue;
+    }
+    if (inFence || !trimmed) {
+      continue;
+    }
+
+    const heading = line.match(/^\s{0,3}#\s+(.+?)\s*#*\s*$/u)?.[1];
+    if (heading) {
+      return legalizeMarkdownBaseName(heading);
+    }
+    if (!firstBodyLine) {
+      firstBodyLine = line;
+    }
+  }
+
+  return legalizeMarkdownBaseName(firstBodyLine);
+}
+
+export function createMarkdownFileName(markdown: string) {
+  return `${deriveMarkdownBaseName(markdown)}.md`;
+}
+
+export function ensureMarkdownFileName(fileName: string, markdown: string) {
+  const trimmed = fileName.trim();
+  if (!trimmed) {
+    return createMarkdownFileName(markdown);
+  }
+  return /\.(?:md|markdown)$/iu.test(trimmed)
+    ? trimmed
+    : `${trimmed}.md`;
+}
+
+export function downloadMarkdown(markdown: string, fileName: string) {
+  const url = URL.createObjectURL(
+    new Blob([markdown], { type: "text/markdown;charset=utf-8" })
+  );
+  const anchor = document.createElement("a");
+  anchor.href = url;
+  anchor.download = fileName;
+  anchor.click();
+  window.setTimeout(() => URL.revokeObjectURL(url), 0);
+}

apps/web/src/document-image-fit.ts

@@ -1,7 +1,9 @@
 import type { ExportConfig } from "@md-to-pdf/core";
 import {
   calculateDiagramPageFit,
-  getPageContentDimensions
+  ensurePageBreakAfter,
+  getPageContentDimensions,
+  getPrecedingMediaTitleHeight
 } from "./diagram-page-fit";
 
 function getImageBlock(image: HTMLImageElement) {
@@ -23,11 +25,30 @@ function getImageBlock(image: HTMLImageElement) {
   return undefined;
 }
 
+export function prepareDocumentImageBlocks(root: ParentNode) {
+  const images = Array.from(
+    root.querySelectorAll<HTMLImageElement>("img.md-document-image")
+  );
+  let prepared = 0;
+
+  for (const image of images) {
+    if (getImageBlock(image)) {
+      prepared += 1;
+    }
+  }
+
+  return prepared;
+}
+
 export function fitDocumentImagesToPage(
   root: ParentNode,
-  config: ExportConfig
+  config: ExportConfig,
+  options: { prepareBlocks?: boolean } = {}
 ) {
   const pageContent = getPageContentDimensions(config);
+  if (options.prepareBlocks !== false) {
+    prepareDocumentImageBlocks(root);
+  }
   const images = Array.from(
     root.querySelectorAll<HTMLImageElement>("img.md-document-image")
   );
@@ -42,11 +63,17 @@ export function fitDocumentImagesToPage(
     const imageHeight = image.getBoundingClientRect().height;
     const blockHeight = block?.getBoundingClientRect().height ?? imageHeight;
     const nonImageHeight = Math.max(0, blockHeight - imageHeight);
+    const titleHeight = block
+      ? getPrecedingMediaTitleHeight(block)
+      : 0;
     const fit = calculateDiagramPageFit(
       { width, height },
       {
         width: pageContent.width,
-        height: Math.max(0, pageContent.height - nonImageHeight)
+        height: Math.max(
+          0,
+          pageContent.height - nonImageHeight - titleHeight
+        )
       }
     );
     if (!fit.scaled) {
@@ -55,6 +82,13 @@ export function fitDocumentImagesToPage(
     if (block?.classList.contains("md-document-image-block")) {
       block.dataset.pageHeightFitted = "true";
       block.style.setProperty("margin-block", "0", "important");
+      block.style.setProperty("break-after", "page", "important");
+      block.style.setProperty(
+        "page-break-after",
+        "always",
+        "important"
+      );
+      ensurePageBreakAfter(block);
     }
     image.dataset.pageHeightFitted = "true";
     image.style.setProperty("display", "block");

apps/web/src/media-page-backfill.ts

@@ -0,0 +1,397 @@
+export type MediaBackfillKind = "image" | "mermaid" | "echarts";
+
+export interface MediaBackfillGeometry {
+  remainingHeight: number;
+  fixedHeight: number;
+  baselineVisualHeight: number;
+}
+
+export interface MediaBackfillCandidate {
+  id: string;
+  scale: number;
+}
+
+export interface MediaBackfillOptions {
+  minimumScale?: number;
+  safetyGapPx?: number;
+}
+
+const MEDIA_BLOCK_SELECTOR = [
+  ".md-document-image-block",
+  ".mermaid:not(.mermaid-error)",
+  ".md-echarts:not(.md-echarts-error)"
+].join(", ");
+const DEFAULT_MINIMUM_SCALE = 0.88;
+const DEFAULT_SAFETY_GAP_PX = 2;
+const SCALE_EPSILON = 0.001;
+
+function finitePositive(value: string | undefined) {
+  const parsed = Number.parseFloat(value ?? "");
+  return Number.isFinite(parsed) && parsed > 0 ? parsed : undefined;
+}
+
+function getMediaKind(block: Element): MediaBackfillKind | undefined {
+  if (block.classList.contains("md-document-image-block")) {
+    return "image";
+  }
+  if (block.classList.contains("mermaid")) {
+    return "mermaid";
+  }
+  if (block.classList.contains("md-echarts")) {
+    return "echarts";
+  }
+  return undefined;
+}
+
+function getMediaVisual(
+  block: Element,
+  kind: MediaBackfillKind
+): HTMLElement | SVGSVGElement | undefined {
+  if (kind === "image") {
+    return (
+      block.querySelector<HTMLImageElement>("img.md-document-image") ??
+      undefined
+    );
+  }
+  if (kind === "echarts") {
+    return (
+      block.querySelector<HTMLElement>(".md-echarts-host") ??
+      undefined
+    );
+  }
+  return (
+    block.querySelector<SVGSVGElement>("svg") ??
+    block.querySelector<HTMLImageElement>("img") ??
+    undefined
+  );
+}
+
+function parsePixelValue(value: string) {
+  const parsed = Number.parseFloat(value);
+  return Number.isFinite(parsed) ? parsed : 0;
+}
+
+function getOuterBottom(element: HTMLElement) {
+  const rect = element.getBoundingClientRect();
+  return (
+    rect.bottom +
+    parsePixelValue(getComputedStyle(element).marginBottom)
+  );
+}
+
+function getOuterTop(element: HTMLElement) {
+  const rect = element.getBoundingClientRect();
+  return (
+    rect.top -
+    parsePixelValue(getComputedStyle(element).marginTop)
+  );
+}
+
+function getMediaGroupTop(
+  block: HTMLElement,
+  pageContentTop: number
+) {
+  const title = block.previousElementSibling;
+  if (
+    title instanceof HTMLElement &&
+    /^H[1-6]$/.test(title.tagName)
+  ) {
+    return Math.max(
+      pageContentTop,
+      getOuterTop(title)
+    );
+  }
+  return Math.max(
+    pageContentTop,
+    getOuterTop(block)
+  );
+}
+
+function getLastContentBottom(pageContent: HTMLElement) {
+  const contentRect = pageContent.getBoundingClientRect();
+  const leafElements = Array.from(
+    pageContent.querySelectorAll<HTMLElement>("[data-ref]")
+  ).filter(
+    (element) => !element.querySelector("[data-ref]")
+  );
+  let bottom = contentRect.top;
+
+  for (const element of leafElements) {
+    const rect = element.getBoundingClientRect();
+    if (
+      rect.width <= 0 ||
+      rect.height <= 0 ||
+      rect.bottom <= contentRect.top ||
+      rect.top >= contentRect.bottom
+    ) {
+      continue;
+    }
+    bottom = Math.max(
+      bottom,
+      Math.min(getOuterBottom(element), contentRect.bottom)
+    );
+  }
+  return bottom;
+}
+
+function hasForcedBreakBefore(block: HTMLElement) {
+  const title = block.previousElementSibling;
+  const elements = [
+    block,
+    title instanceof HTMLElement && /^H[1-6]$/.test(title.tagName)
+      ? title
+      : undefined
+  ].filter((element): element is HTMLElement => Boolean(element));
+  return elements.some((element) => {
+    const style = getComputedStyle(element);
+    return (
+      style.breakBefore === "page" ||
+      style.pageBreakBefore === "always"
+    );
+  });
+}
+
+export function calculateMediaBackfillScale(
+  geometry: MediaBackfillGeometry,
+  options: MediaBackfillOptions = {}
+) {
+  const minimumScale =
+    options.minimumScale ?? DEFAULT_MINIMUM_SCALE;
+  const safetyGapPx =
+    options.safetyGapPx ?? DEFAULT_SAFETY_GAP_PX;
+  if (
+    !Number.isFinite(geometry.remainingHeight) ||
+    !Number.isFinite(geometry.fixedHeight) ||
+    !Number.isFinite(geometry.baselineVisualHeight) ||
+    geometry.remainingHeight <= 0 ||
+    geometry.fixedHeight < 0 ||
+    geometry.baselineVisualHeight <= 0 ||
+    !Number.isFinite(minimumScale) ||
+    minimumScale <= 0 ||
+    minimumScale >= 1 ||
+    !Number.isFinite(safetyGapPx) ||
+    safetyGapPx < 0
+  ) {
+    return undefined;
+  }
+
+  const availableVisualHeight =
+    geometry.remainingHeight -
+    geometry.fixedHeight -
+    safetyGapPx;
+  const scale =
+    availableVisualHeight / geometry.baselineVisualHeight;
+  if (
+    scale < minimumScale ||
+    scale >= 1 - SCALE_EPSILON
+  ) {
+    return undefined;
+  }
+  return scale;
+}
+
+export function prepareMediaBackfillBlocks(root: ParentNode) {
+  const blocks = Array.from(
+    root.querySelectorAll<HTMLElement>(MEDIA_BLOCK_SELECTOR)
+  );
+  let prepared = 0;
+
+  for (const [index, block] of blocks.entries()) {
+    const kind = getMediaKind(block);
+    const visual = kind ? getMediaVisual(block, kind) : undefined;
+    const rect = visual?.getBoundingClientRect();
+    if (
+      !kind ||
+      !visual ||
+      !rect ||
+      rect.width <= 0 ||
+      rect.height <= 0
+    ) {
+      continue;
+    }
+
+    block.dataset.mediaBackfillId = `media-${index + 1}`;
+    block.dataset.mediaBackfillKind = kind;
+    block.dataset.mediaBaselineWidth = String(rect.width);
+    block.dataset.mediaBaselineHeight = String(rect.height);
+    prepared += 1;
+  }
+
+  return prepared;
+}
+
+export function getMediaBackfillIdsInDocumentOrder(
+  root: ParentNode
+) {
+  return Array.from(
+    root.querySelectorAll<HTMLElement>(
+      "[data-media-backfill-id]"
+    )
+  ).flatMap((block) =>
+    block.dataset.mediaBackfillId
+      ? [block.dataset.mediaBackfillId]
+      : []
+  );
+}
+
+export function findMediaBackfillCandidates(
+  root: ParentNode,
+  options: MediaBackfillOptions = {}
+) {
+  const pages = Array.from(
+    root.querySelectorAll<HTMLElement>(".pagedjs_page")
+  );
+  const candidates: MediaBackfillCandidate[] = [];
+  const candidateIds = new Set<string>();
+
+  for (let pageIndex = 1; pageIndex < pages.length; pageIndex += 1) {
+    const previousPage = pages[pageIndex - 1];
+    const currentPage = pages[pageIndex];
+    const previousContent =
+      previousPage?.querySelector<HTMLElement>(
+        ".pagedjs_page_content"
+      );
+    const currentContent =
+      currentPage?.querySelector<HTMLElement>(
+        ".pagedjs_page_content"
+      );
+    if (!previousContent || !currentContent) {
+      continue;
+    }
+
+    const mediaBlocks = Array.from(
+      currentContent.querySelectorAll<HTMLElement>(
+        "[data-media-backfill-id]"
+      )
+    ).sort(
+      (left, right) =>
+        left.getBoundingClientRect().top -
+        right.getBoundingClientRect().top
+    );
+    const block = mediaBlocks[0];
+    if (!block) {
+      continue;
+    }
+
+    const kind = getMediaKind(block);
+    const visual = kind ? getMediaVisual(block, kind) : undefined;
+    const id = block.dataset.mediaBackfillId;
+    const baselineVisualHeight = finitePositive(
+      block.dataset.mediaBaselineHeight
+    );
+    if (!kind || !visual || !id || !baselineVisualHeight) {
+      continue;
+    }
+
+    if (hasForcedBreakBefore(block)) {
+      continue;
+    }
+    const currentContentRect = currentContent.getBoundingClientRect();
+    const visualHeight = visual.getBoundingClientRect().height;
+    const mediaGroupTop = getMediaGroupTop(
+      block,
+      currentContentRect.top
+    );
+    const fixedHeight = Math.max(
+      0,
+      getOuterBottom(block) -
+        mediaGroupTop -
+        visualHeight
+    );
+
+    const previousContentRect =
+      previousContent.getBoundingClientRect();
+    const previousFlowBottom =
+      getLastContentBottom(previousContent);
+    const remainingHeight = Math.max(
+      0,
+      previousContentRect.bottom - previousFlowBottom
+    );
+    const scale = calculateMediaBackfillScale(
+      {
+        remainingHeight,
+        fixedHeight,
+        baselineVisualHeight
+      },
+      options
+    );
+    if (scale === undefined || candidateIds.has(id)) {
+      continue;
+    }
+    candidateIds.add(id);
+    candidates.push({ id, scale });
+  }
+
+  return candidates;
+}
+
+function setVisualSize(
+  visual: HTMLElement | SVGSVGElement,
+  width: number,
+  height: number
+) {
+  visual.style.setProperty("display", "block");
+  visual.style.setProperty("width", `${width}px`, "important");
+  visual.style.setProperty("height", `${height}px`, "important");
+  visual.style.setProperty("max-width", "100%", "important");
+  visual.style.setProperty("max-height", `${height}px`, "important");
+  visual.style.setProperty("margin-inline", "auto", "important");
+}
+
+export function applyMediaBackfillCandidates(
+  source: ParentNode,
+  candidates: MediaBackfillCandidate[]
+) {
+  let applied = 0;
+  for (const candidate of candidates) {
+    const block = Array.from(
+      source.querySelectorAll<HTMLElement>(
+        "[data-media-backfill-id]"
+      )
+    ).find(
+      (element) =>
+        element.dataset.mediaBackfillId === candidate.id
+    );
+    const kind = block ? getMediaKind(block) : undefined;
+    const baselineWidth = finitePositive(
+      block?.dataset.mediaBaselineWidth
+    );
+    const baselineHeight = finitePositive(
+      block?.dataset.mediaBaselineHeight
+    );
+    const visual =
+      block && kind ? getMediaVisual(block, kind) : undefined;
+    if (
+      !block ||
+      !kind ||
+      !visual ||
+      !baselineWidth ||
+      !baselineHeight ||
+      !Number.isFinite(candidate.scale) ||
+      candidate.scale <= 0 ||
+      candidate.scale >= 1
+    ) {
+      continue;
+    }
+
+    const width = baselineWidth * candidate.scale;
+    const height = baselineHeight * candidate.scale;
+    block.dataset.mediaBackfilled = "true";
+    block.dataset.mediaBackfillScale = String(candidate.scale);
+    setVisualSize(visual, width, height);
+
+    if (kind === "image") {
+      visual.style.setProperty("object-fit", "contain");
+    } else if (kind === "echarts") {
+      const svg = block.querySelector<SVGSVGElement>(
+        ".md-echarts-host svg"
+      );
+      if (svg) {
+        setVisualSize(svg, width, height);
+      }
+      visual.style.removeProperty("aspect-ratio");
+    }
+    applied += 1;
+  }
+  return applied;
+}

apps/web/src/paged-document-runtime.ts

@@ -7,7 +7,16 @@ import type {
 } from "@md-to-pdf/core";
 import { Previewer } from "pagedjs";
 import { fitOversizedEChartsToPage } from "./echarts-page-fit";
-import { fitDocumentImagesToPage } from "./document-image-fit";
+import {
+  fitDocumentImagesToPage,
+  prepareDocumentImageBlocks
+} from "./document-image-fit";
+import {
+  applyMediaBackfillCandidates,
+  findMediaBackfillCandidates,
+  getMediaBackfillIdsInDocumentOrder,
+  prepareMediaBackfillBlocks
+} from "./media-page-backfill";
 import { createMermaidSiteConfig } from "./mermaid-config";
 import {
   fitOversizedMermaidToPage,
@@ -232,6 +241,31 @@ export class PagedDocumentRuntime {
     );
   }
 
+  private async replaceEChartsSvgWithImages(container: ParentNode) {
+    const { freezeEChartsSvg } = await this.loadECharts();
+    const figures = Array.from(
+      container.querySelectorAll<HTMLElement>(
+        ".md-echarts:not(.md-echarts-error)"
+      )
+    );
+    for (const figure of figures) {
+      const host = figure.querySelector<HTMLElement>(
+        ".md-echarts-host"
+      );
+      const svg = host?.querySelector<SVGSVGElement>("svg");
+      if (!host || !svg) {
+        continue;
+      }
+      const label =
+        host.getAttribute("aria-label") || "ECharts 图表";
+      host.replaceChildren(
+        freezeEChartsSvg(host, svg, "svg-image", label)
+      );
+      figure.dataset.echartsRendered = "svg-image";
+    }
+    await waitForImages(container);
+  }
+
   private async renderMermaid(
     container: DocumentFragment,
     payload: PagedPreviewPayload
@@ -346,9 +380,12 @@ export class PagedDocumentRuntime {
         );
         echartsMs = performance.now() - echartsStartedAt;
         await waitForImages(measurement.host);
+        prepareDocumentImageBlocks(measurement.host);
+        prepareMediaBackfillBlocks(measurement.host);
         fitDocumentImagesToPage(
           measurement.host,
-          payload.exportConfig
+          payload.exportConfig,
+          { prepareBlocks: false }
         );
 
         const echartsFitStartedAt = performance.now();
@@ -356,6 +393,7 @@ export class PagedDocumentRuntime {
           measurement.host,
           payload.exportConfig
         );
+        await this.replaceEChartsSvgWithImages(measurement.host);
         echartsFitMs =
           performance.now() - echartsFitStartedAt;
 
@@ -388,29 +426,74 @@ export class PagedDocumentRuntime {
     const resourceWaitMs = performance.now() - resourceWaitStartedAt;
 
     const paginationStartedAt = performance.now();
-    const previewer = new Previewer();
+    const repaginationSource = content.cloneNode(
+      true
+    ) as DocumentFragment;
+    const stylesheets = [
+      stylesheet(documentRef, documentBaseCss, "document-base"),
+      stylesheet(documentRef, highlightCss, "highlight"),
+      stylesheet(documentRef, katexCss, "katex"),
+      stylesheet(documentRef, echartsCss, "echarts"),
+      stylesheet(documentRef, payload.themeCss, "theme"),
+      stylesheet(
+        documentRef,
+        documentGeometryCss,
+        "document-geometry"
+      ),
+      stylesheet(
+        documentRef,
+        buildPagedMediaCss(payload.exportConfig, payload),
+        "paged-media"
+      )
+    ];
+    let previewer = new Previewer();
     this.activePreviewer = previewer;
-    const flow = await previewer.preview(
+    let flow = await previewer.preview(
       content,
-      [
-        stylesheet(documentRef, documentBaseCss, "document-base"),
-        stylesheet(documentRef, highlightCss, "highlight"),
-        stylesheet(documentRef, katexCss, "katex"),
-        stylesheet(documentRef, echartsCss, "echarts"),
-        stylesheet(documentRef, payload.themeCss, "theme"),
-        stylesheet(
-          documentRef,
-          documentGeometryCss,
-          "document-geometry"
-        ),
-        stylesheet(
-          documentRef,
-          buildPagedMediaCss(payload.exportConfig, payload),
-          "paged-media"
-        )
-      ],
+      stylesheets,
       this.root
     );
+    const mediaIds = getMediaBackfillIdsInDocumentOrder(
+      repaginationSource
+    );
+    let mediaCandidates = new Map(
+      findMediaBackfillCandidates(this.root).map((candidate) => [
+        candidate.id,
+        candidate
+      ])
+    );
+    for (const mediaId of mediaIds) {
+      if (!shouldContinue()) {
+        break;
+      }
+      const candidate = mediaCandidates.get(mediaId);
+      if (
+        !candidate ||
+        applyMediaBackfillCandidates(repaginationSource, [
+          candidate
+        ]) === 0
+      ) {
+        continue;
+      }
+
+      previewer.chunker.destroy();
+      previewer.polisher.destroy();
+      previewer = new Previewer();
+      this.activePreviewer = previewer;
+      flow = await previewer.preview(
+        repaginationSource.cloneNode(true) as DocumentFragment,
+        stylesheets,
+        this.root
+      );
+      mediaCandidates = new Map(
+        findMediaBackfillCandidates(this.root).map(
+          (nextCandidate) => [
+            nextCandidate.id,
+            nextCandidate
+          ]
+        )
+      );
+    }
     const paginationMs = performance.now() - paginationStartedAt;
 
     if (!shouldContinue()) {

apps/web/src/sample-markdown.ts

@@ -0,0 +1,194 @@
+const wideImageBase64 =
+  "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";
+const portraitImageBase64 =
+  "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";
+const boundaryImageBase64 =
+  "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";
+
+export const sampleMarkdown = `---
+title: Markdown PDF 媒体分页示例
+author: 内网文档团队
+keywords:
+  - Markdown
+  - PDF
+  - 媒体分页
+---
+
+# Markdown PDF 媒体分页示例
+
+这份文档集中展示常用排版、不同尺寸图片、Mermaid 与 ECharts 的渲染和分页效果。
+
+## 基础排版
+
+- [x] Markdown 实时预览
+- [x] 图片、Mermaid 与 ECharts
+- [x] 快速预览和精确 PDF 预览
+- [ ] 根据实际文档继续扩展主题
+
+| 能力 | 示例用途 |
+| --- | --- |
+| 表格与任务列表 | 验证主题基础样式 |
+| 数学公式 | 验证字体和基线 |
+| 媒体块 | 验证限宽、缩放与分页 |
+
+行内公式：$E = mc^2$。
+
+> 预览与 PDF 共用相同的渲染结果、主题 CSS 和分页结构。
+
+## 网络图片
+
+下面只保留一张网络图片，用于验证远程资源获取与离线失败提示。
+
+![NASA 地球网络图片](https://images-assets.nasa.gov/image/PIA18033/PIA18033~medium.jpg)
+
+## Base64 图片块
+
+### 横向图片：限宽基准
+
+1600 × 900 的横图会先按正文宽度等比例收缩，收缩后的高度才是分页算法使用的基准高度。
+
+![Base64 横向图片 1600×900][base64-wide]
+
+### 边界图片：上一页空白回填
+
+这一段用于形成稳定的分页边界。分页算法会保留标题、图注和间距的原始尺寸，只计算图片主体还能使用的高度。如果主体只需轻微缩小，并且缩放率仍在允许范围内，就尝试回填到上一页空白区域。
+
+为了覆盖长文档场景，这里继续补充少量正文，使媒体块靠近默认 A4 页面底部。媒体元素必须按照源文档顺序串行处理，前一个媒体完成重排以后，后一个媒体才基于新的版面重新计算。
+
+![Base64 边界图片 1200×880][base64-boundary]
+
+### 纵向图片：单页高度适配
+
+900 × 1800 的纵图在限宽后仍可能超过单页内容区，此时应继续等比例缩小并完整放在一页内。
+
+![Base64 纵向图片 900×1800][base64-portrait]
+
+## Mermaid 尺寸示例
+
+### 横向流程图：限宽
+
+\`\`\`mermaid
+flowchart LR
+  A["Markdown"] --> B["统一 HTML"]
+  B --> C["主题 CSS"]
+  C --> D["网页预览"]
+  C --> E["PDF 导出"]
+\`\`\`
+
+### 纵向流程图：高度和分页
+
+\`\`\`mermaid
+flowchart TB
+  A["读取文档"] --> B["解析 Front Matter"]
+  B --> C["渲染 Markdown"]
+  C --> D["渲染 Mermaid"]
+  D --> E["渲染 ECharts"]
+  E --> F["等待图片与字体"]
+  F --> G["首次分页"]
+  G --> H["串行检查媒体块"]
+  H --> I["必要时重新分页"]
+  I --> J["生成 PDF"]
+\`\`\`
+
+## ECharts 尺寸示例
+
+### 紧凑图表：40mm
+
+\`\`\`echarts
+caption: 紧凑柱状图（40mm）
+height: 40mm
+option:
+  xAxis:
+    type: category
+    data: [研发, 产品, 设计, 运营]
+  yAxis:
+    type: value
+  series:
+    - type: bar
+      data: [28, 18, 15, 22]
+\`\`\`
+
+### 标准图表：58mm
+
+\`\`\`echarts
+caption: 产品能力树（58mm）
+height: 58mm
+option:
+  series:
+    - type: tree
+      orient: LR
+      label:
+        position: left
+      data:
+        - name: 文档平台
+          children:
+            - name: Markdown
+              children:
+                - name: Mermaid
+                - name: ECharts
+            - name: PDF
+              children:
+                - name: 快速预览
+                - name: 精确预览
+\`\`\`
+
+大型图表的 caption 保持原尺寸，仅缩放图表主体。
+
+### 大型图表：85mm
+
+\`\`\`echarts
+caption: 模块工作量占比（85mm）
+height: 85mm
+option:
+  series:
+    - type: treemap
+      roam: false
+      nodeClick: false
+      breadcrumb:
+        show: false
+      label:
+        show: true
+        formatter: "{b}"
+      data:
+        - name: 渲染
+          children:
+            - { name: Markdown, value: 32 }
+            - { name: ECharts, value: 24 }
+            - { name: Mermaid, value: 18 }
+        - name: 导出
+          children:
+            - { name: PDF, value: 28 }
+            - { name: 主题, value: 12 }
+\`\`\`
+
+## 串行媒体块
+
+下面连续放置图片、Mermaid 和 ECharts，用于观察长文档中多个媒体元素是否始终按源文档顺序计算。
+
+![Base64 串行边界图片][base64-boundary]
+
+\`\`\`mermaid
+flowchart LR
+  A["图片完成"] --> B["Mermaid 计算"]
+  B --> C["ECharts 计算"]
+\`\`\`
+
+\`\`\`echarts
+caption: 串行媒体收尾图（58mm）
+height: 58mm
+option:
+  series:
+    - type: pie
+      radius: [35%, 70%]
+      data:
+        - { name: 图片, value: 36 }
+        - { name: Mermaid, value: 28 }
+        - { name: ECharts, value: 36 }
+\`\`\`
+
+> 所有媒体仅在额外缩放不超过阈值时回填；否则保持完整媒体块并移动到下一页。
+
+[base64-wide]: data:image/png;base64,${wideImageBase64}
+[base64-portrait]: data:image/png;base64,${portraitImageBase64}
+[base64-boundary]: data:image/png;base64,${boundaryImageBase64}
+`;

apps/web/src/styles.css

@@ -24,8 +24,7 @@ textarea {
   font: inherit;
 }
 
-button,
-.file-button {
+button {
   min-height: 40px;
   padding: 0 16px;
   border: 1px solid #b8c2bd;
@@ -102,13 +101,31 @@ button:disabled {
   border-left: 1px solid #d4dad7;
 }
 
-.document-summary > strong {
+.document-name-row {
+  display: flex;
+  align-items: center;
+  gap: 7px;
+  min-width: 0;
+}
+
+.document-name-row > strong {
   overflow: hidden;
   font-size: 0.82rem;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
+.unsaved-badge {
+  flex: none;
+  padding: 1px 6px;
+  border: 1px solid #d9bd86;
+  border-radius: 999px;
+  background: #fff7e7;
+  color: #8a5a13;
+  font-size: 0.62rem;
+  font-weight: 800;
+}
+
 .document-summary .render-status {
   max-width: 100%;
   margin-top: 3px;
@@ -138,17 +155,37 @@ h1 {
   gap: 10px;
 }
 
-.file-button {
-  display: inline-flex;
-  align-items: center;
+.more-menu {
+  position: relative;
 }
 
-.file-button input {
+.more-menu-popover {
   position: absolute;
-  width: 1px;
-  height: 1px;
-  overflow: hidden;
-  clip: rect(0 0 0 0);
+  z-index: 30;
+  top: calc(100% + 8px);
+  right: 0;
+  display: flex;
+  min-width: 220px;
+  padding: 6px;
+  border: 1px solid #c8d1cc;
+  border-radius: 10px;
+  background: #fff;
+  box-shadow: 0 12px 30px rgb(38 58 50 / 18%);
+  flex-direction: column;
+}
+
+.more-menu-popover button {
+  width: 100%;
+  min-height: 36px;
+  padding: 0 11px;
+  border: 0;
+  background: transparent;
+  text-align: left;
+}
+
+.more-menu-popover button:hover,
+.more-menu-popover button:focus-visible {
+  background: #edf3f0;
 }
 
 .editor-layout {

apps/web/src/use-theme-resources.ts

@@ -9,7 +9,11 @@ export type { ThemeSummary } from "./application-backend";
 
 export function useThemeResources(
   themeId: string,
-  onThemesLoaded: (themes: ThemeSummary[]) => void
+  onThemesLoaded: (
+    themes: ThemeSummary[],
+    refreshKey: number
+  ) => void,
+  refreshKey = 0
 ) {
   const [themes, setThemes] = useState<ThemeSummary[]>([]);
   const [themeCss, setThemeCss] = useState("");
@@ -23,7 +27,7 @@ export function useThemeResources(
       .then(({ themes: availableThemes }) => {
         setThemes(availableThemes);
         setCatalogError("");
-        onThemesLoaded(availableThemes);
+        onThemesLoaded(availableThemes, refreshKey);
       })
       .catch((reason: unknown) => {
         if (!controller.signal.aborted) {
@@ -34,7 +38,7 @@ export function useThemeResources(
       });
 
     return () => controller.abort();
-  }, [onThemesLoaded]);
+  }, [onThemesLoaded, refreshKey]);
 
   useEffect(() => {
     const controller = new AbortController();
@@ -52,7 +56,7 @@ export function useThemeResources(
       });
 
     return () => controller.abort();
-  }, [themeId]);
+  }, [refreshKey, themeId]);
 
   return {
     error: catalogError || cssError,

apps/web/src/vite-env.d.ts

@@ -24,6 +24,22 @@ declare global {
         }
       | undefined
     >;
+    consumePendingMarkdown(): Promise<
+      | {
+          markdown: string;
+          fileName: string;
+        }
+      | undefined
+    >;
+    discardPendingMarkdown(): Promise<void>;
+    onMarkdownOpened(listener: () => void): () => void;
+    startNewMarkdown(): Promise<void>;
+    saveMarkdown(
+      fileName: string,
+      markdown: string
+    ): Promise<{ fileName: string } | undefined>;
+    openThemeDirectory(): Promise<string>;
+    refreshThemes(): Promise<void>;
     renderMarkdown(input: {
       markdown: string;
       language: string;

apps/web/tests/app-version.test.ts

@@ -6,7 +6,7 @@ import {
 
 describe("应用版本", () => {
   it("从统一构建版本生成标题徽标", () => {
-    expect(APP_VERSION).toBe("0.4.2");
-    expect(APP_VERSION_LABEL).toBe("v0.4.2");
+    expect(APP_VERSION).toBe("0.4.5");
+    expect(APP_VERSION_LABEL).toBe("v0.4.5");
   });
 });

apps/web/tests/document-file.test.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it } from "vitest";
+import {
+  createMarkdownFileName,
+  deriveMarkdownBaseName,
+  ensureMarkdownFileName,
+  legalizeMarkdownBaseName
+} from "../src/document-file";
+
+describe("Markdown 默认文件名", () => {
+  it("优先使用 Front Matter 与代码围栏之外的一级标题", () => {
+    expect(
+      deriveMarkdownBaseName(`---
+title: 元数据标题
+---
+第一行正文
+
+\`\`\`markdown
+# 围栏标题
+\`\`\`
+
+# 2026 年研发周报：第 31 周`)
+    ).toBe("2026 年研发周报 第 31 周");
+  });
+
+  it("没有一级标题时使用第一行非空正文", () => {
+    expect(
+      createMarkdownFileName(
+        "\n\n> **本周完成** [API 重构](https://example.com)\n后续内容"
+      )
+    ).toBe("本周完成 API 重构.md");
+  });
+
+  it("四字符围栏不会被较短的同类围栏提前关闭", () => {
+    expect(
+      deriveMarkdownBaseName(`\`\`\`\`markdown
+# 围栏内标题
+\`\`\`
+# 仍在围栏内
+\`\`\`\`
+# 正文标题`)
+    ).toBe("正文标题");
+  });
+
+  it("清理非法字符并规避 Windows 保留名称", () => {
+    expect(legalizeMarkdownBaseName('季度总结：<测试> / "版本"')).toBe(
+      "季度总结 测试 版本"
+    );
+    expect(legalizeMarkdownBaseName("CON")).toBe("文档 CON");
+  });
+
+  it("空文档使用回退文件名并限制名称长度", () => {
+    expect(createMarkdownFileName(" \n")).toBe("未命名文档.md");
+    expect(legalizeMarkdownBaseName("文".repeat(150))).toHaveLength(100);
+  });
+
+  it("保留已有 Markdown 扩展名", () => {
+    expect(ensureMarkdownFileName("报告.markdown", "# 报告")).toBe(
+      "报告.markdown"
+    );
+    expect(ensureMarkdownFileName("报告", "# 报告")).toBe("报告.md");
+  });
+});

apps/web/tests/echarts-page-fit.test.ts

@@ -8,6 +8,7 @@ describe("ECharts 单页高度适配", () => {
   it("将超高 SVG 和宿主同步缩放到单页内容区", () => {
     const root = document.createElement("div");
     root.innerHTML = `
+      <h2 style="margin: 10px 0">大型图表</h2>
       <figure class="md-echarts">
         <div class="md-echarts-host" style="height: 2000px">
           <svg width="1000" height="2000"></svg>
@@ -15,22 +16,43 @@ describe("ECharts 单页高度适配", () => {
       </figure>
     `;
 
-    fitOversizedEChartsToPage(root, defaultExportConfig);
-
     const figure = root.querySelector<HTMLElement>(".md-echarts");
+    const title = root.querySelector<HTMLElement>("h2");
     const host = root.querySelector<HTMLElement>(
       ".md-echarts-host"
     );
     const svg = root.querySelector<SVGSVGElement>("svg");
+    if (title) {
+      title.getBoundingClientRect = () => ({
+        x: 0,
+        y: 0,
+        top: 0,
+        left: 0,
+        right: 700,
+        bottom: 40,
+        width: 700,
+        height: 40,
+        toJSON: () => ({})
+      });
+    }
+    fitOversizedEChartsToPage(root, defaultExportConfig);
+
     expect(figure?.dataset.pageHeightFitted).toBe("true");
+    expect(title?.style.breakAfter).toBe("avoid-page");
+    expect(figure?.style.breakAfter).toBe("page");
+    expect(figure?.style.pageBreakAfter).toBe("always");
+    expect(figure?.nextElementSibling).toHaveProperty(
+      "dataset.mediaPageBreak",
+      "true"
+    );
     expect(Number.parseFloat(host?.style.height ?? "0")).toBeCloseTo(
-      1000.5748,
+      960.5748,
       3
     );
     expect(host?.style.aspectRatio).toBe("");
     expect(svg?.getAttribute("viewBox")).toBe("0 0 1000 2000");
     expect(Number.parseFloat(svg?.style.height ?? "0")).toBeCloseTo(
-      1000.5748,
+      960.5748,
       3
     );
   });

apps/web/tests/media-page-backfill.test.ts

@@ -0,0 +1,329 @@
+// @vitest-environment happy-dom
+
+import { describe, expect, it } from "vitest";
+import {
+  applyMediaBackfillCandidates,
+  calculateMediaBackfillScale,
+  findMediaBackfillCandidates,
+  getMediaBackfillIdsInDocumentOrder,
+  prepareMediaBackfillBlocks
+} from "../src/media-page-backfill";
+import { getPrecedingMediaTitleHeight } from "../src/diagram-page-fit";
+
+function rect(width: number, height: number) {
+  return {
+    x: 0,
+    y: 0,
+    top: 0,
+    left: 0,
+    right: width,
+    bottom: height,
+    width,
+    height,
+    toJSON: () => ({})
+  };
+}
+
+function positionedRect(
+  top: number,
+  width: number,
+  height: number
+) {
+  return {
+    ...rect(width, height),
+    y: top,
+    top,
+    bottom: top + height
+  };
+}
+
+describe("媒体分页空白回填", () => {
+  it("全页适配时保留前置标题高度并避免标题孤行", () => {
+    const root = document.createElement("div");
+    root.innerHTML = `
+      <h2 style="margin: 10px 0 12px">媒体标题</h2>
+      <div class="mermaid"></div>
+    `;
+    const title = root.querySelector<HTMLElement>("h2")!;
+    const block = root.querySelector<HTMLElement>(".mermaid")!;
+    title.getBoundingClientRect = () =>
+      positionedRect(100, 600, 40);
+
+    expect(getPrecedingMediaTitleHeight(block)).toBe(40);
+    expect(title.style.getPropertyValue("break-after")).toBe(
+      "avoid-page"
+    );
+    expect(title.style.getPropertyPriority("break-after")).toBe(
+      "important"
+    );
+  });
+
+  it("按限宽后的基准高度计算额外缩放率", () => {
+    expect(
+      calculateMediaBackfillScale({
+        remainingHeight: 420,
+        fixedHeight: 30,
+        baselineVisualHeight: 430
+      })
+    ).toBeCloseTo(388 / 430, 6);
+  });
+
+  it("缩小超过阈值或无需缩小时不回填", () => {
+    expect(
+      calculateMediaBackfillScale({
+        remainingHeight: 300,
+        fixedHeight: 30,
+        baselineVisualHeight: 430
+      })
+    ).toBeUndefined();
+    expect(
+      calculateMediaBackfillScale({
+        remainingHeight: 500,
+        fixedHeight: 30,
+        baselineVisualHeight: 430
+      })
+    ).toBeUndefined();
+  });
+
+  it("记录图片限宽后的实际基准尺寸", () => {
+    const root = document.createElement("div");
+    root.innerHTML = `
+      <figure class="md-document-image-block">
+        <img class="md-document-image">
+        <figcaption>标题</figcaption>
+      </figure>
+    `;
+    const image = root.querySelector("img")!;
+    image.getBoundingClientRect = () => rect(640, 480);
+
+    expect(prepareMediaBackfillBlocks(root)).toBe(1);
+    const figure = root.querySelector<HTMLElement>("figure")!;
+    expect(figure.dataset.mediaBackfillKind).toBe("image");
+    expect(figure.dataset.mediaBaselineWidth).toBe("640");
+    expect(figure.dataset.mediaBaselineHeight).toBe("480");
+  });
+
+  it("保持媒体元素在源文档中的串行处理顺序", () => {
+    const root = document.createElement("div");
+    root.innerHTML = `
+      <figure data-media-backfill-id="media-2"></figure>
+      <div><figure data-media-backfill-id="media-1"></figure></div>
+      <figure></figure>
+    `;
+
+    expect(getMediaBackfillIdsInDocumentOrder(root)).toEqual([
+      "media-2",
+      "media-1"
+    ]);
+  });
+
+  it("根据上一页剩余区域生成一次回填候选", () => {
+    const root = document.createElement("div");
+    root.innerHTML = `
+      <div class="pagedjs_page">
+        <div class="pagedjs_page_content">
+          <div
+            class="pagedjs_page_content_flow"
+            data-ref="previous-content"
+          >上一页内容</div>
+        </div>
+      </div>
+      <div class="pagedjs_page">
+        <div class="pagedjs_page_content">
+          <h2 data-ref="media-title">图片标题</h2>
+          <figure
+            class="md-document-image-block"
+            data-media-backfill-id="media-1"
+            data-media-baseline-width="600"
+            data-media-baseline-height="400"
+          >
+            <img class="md-document-image">
+          </figure>
+        </div>
+      </div>
+    `;
+    const pageContents = root.querySelectorAll<HTMLElement>(
+      ".pagedjs_page_content"
+    );
+    const previousFlow =
+      pageContents[0]!.firstElementChild as HTMLElement;
+    const title = root.querySelector<HTMLElement>("h2")!;
+    const block = root.querySelector<HTMLElement>("figure")!;
+    const image = root.querySelector<HTMLImageElement>("img")!;
+    pageContents[0]!.getBoundingClientRect = () =>
+      positionedRect(100, 700, 1_000);
+    previousFlow.getBoundingClientRect = () =>
+      positionedRect(100, 700, 550);
+    pageContents[1]!.getBoundingClientRect = () =>
+      positionedRect(100, 700, 1_000);
+    title.getBoundingClientRect = () =>
+      positionedRect(100, 600, 40);
+    block.getBoundingClientRect = () =>
+      positionedRect(150, 600, 330);
+    image.getBoundingClientRect = () =>
+      positionedRect(150, 600, 300);
+
+    expect(findMediaBackfillCandidates(root)).toEqual([
+      { id: "media-1", scale: 0.92 }
+    ]);
+  });
+
+  it("显式分页的媒体块不会回填到上一页", () => {
+    const root = document.createElement("div");
+    root.innerHTML = `
+      <div class="pagedjs_page">
+        <div class="pagedjs_page_content"></div>
+      </div>
+      <div class="pagedjs_page">
+        <div class="pagedjs_page_content">
+          <h2 data-ref="media-title" style="break-before: page">
+            图片标题
+          </h2>
+          <figure
+            class="md-document-image-block"
+            data-ref="media-block"
+            data-media-backfill-id="media-1"
+            data-media-baseline-width="600"
+            data-media-baseline-height="400"
+          >
+            <img class="md-document-image">
+          </figure>
+        </div>
+      </div>
+    `;
+    const pageContents = root.querySelectorAll<HTMLElement>(
+      ".pagedjs_page_content"
+    );
+    const title = root.querySelector<HTMLElement>("h2")!;
+    const block = root.querySelector<HTMLElement>("figure")!;
+    const image = root.querySelector<HTMLImageElement>("img")!;
+    pageContents[0]!.getBoundingClientRect = () =>
+      positionedRect(100, 700, 1_000);
+    pageContents[1]!.getBoundingClientRect = () =>
+      positionedRect(100, 700, 1_000);
+    title.getBoundingClientRect = () =>
+      positionedRect(100, 600, 40);
+    block.getBoundingClientRect = () =>
+      positionedRect(150, 600, 330);
+    image.getBoundingClientRect = () =>
+      positionedRect(150, 600, 300);
+
+    expect(findMediaBackfillCandidates(root)).toEqual([]);
+  });
+
+  it("忽略媒体之前其他内容的显式分页规则", () => {
+    const root = document.createElement("div");
+    root.innerHTML = `
+      <div class="pagedjs_page">
+        <div class="pagedjs_page_content">
+          <div data-ref="previous-content">上一页内容</div>
+        </div>
+      </div>
+      <div class="pagedjs_page">
+        <div class="pagedjs_page_content">
+          <h1 data-ref="earlier-heading" style="break-before: page">
+            本页章节
+          </h1>
+          <h2 data-ref="media-title">图片标题</h2>
+          <figure
+            class="md-document-image-block"
+            data-ref="media-block"
+            data-media-backfill-id="media-1"
+            data-media-baseline-width="600"
+            data-media-baseline-height="400"
+          >
+            <img class="md-document-image">
+          </figure>
+        </div>
+      </div>
+    `;
+    const pageContents = root.querySelectorAll<HTMLElement>(
+      ".pagedjs_page_content"
+    );
+    const previousFlow = root.querySelector<HTMLElement>(
+      "[data-ref='previous-content']"
+    )!;
+    const earlierHeading = root.querySelector<HTMLElement>("h1")!;
+    const title = root.querySelector<HTMLElement>("h2")!;
+    const block = root.querySelector<HTMLElement>("figure")!;
+    const image = root.querySelector<HTMLImageElement>("img")!;
+    pageContents[0]!.getBoundingClientRect = () =>
+      positionedRect(100, 700, 1_000);
+    previousFlow.getBoundingClientRect = () =>
+      positionedRect(100, 700, 550);
+    pageContents[1]!.getBoundingClientRect = () =>
+      positionedRect(100, 700, 1_000);
+    earlierHeading.getBoundingClientRect = () =>
+      positionedRect(100, 600, 40);
+    title.getBoundingClientRect = () =>
+      positionedRect(150, 600, 40);
+    block.getBoundingClientRect = () =>
+      positionedRect(200, 600, 330);
+    image.getBoundingClientRect = () =>
+      positionedRect(200, 600, 300);
+
+    expect(findMediaBackfillCandidates(root)).toEqual([
+      { id: "media-1", scale: 0.92 }
+    ]);
+  });
+
+  it("将候选缩放应用到图片和 ECharts 主体", () => {
+    const root = document.createElement("div");
+    root.innerHTML = `
+      <h2>图片标题保持原尺寸</h2>
+      <figure
+        class="md-document-image-block"
+        data-media-backfill-id="media-1"
+        data-media-backfill-kind="image"
+        data-media-baseline-width="800"
+        data-media-baseline-height="600"
+      >
+        <img class="md-document-image">
+      </figure>
+      <figure
+        class="md-echarts"
+        data-media-backfill-id="media-2"
+        data-media-backfill-kind="echarts"
+        data-media-baseline-width="700"
+        data-media-baseline-height="500"
+      >
+        <div class="md-echarts-host"><svg></svg></div>
+      </figure>
+      <div
+        class="mermaid"
+        data-media-backfill-id="media-3"
+        data-media-backfill-kind="mermaid"
+        data-media-baseline-width="600"
+        data-media-baseline-height="400"
+      >
+        <svg></svg>
+      </div>
+    `;
+
+    expect(
+      applyMediaBackfillCandidates(root, [
+        { id: "media-1", scale: 0.9 },
+        { id: "media-2", scale: 0.88 },
+        { id: "media-3", scale: 0.9 }
+      ])
+    ).toBe(3);
+    const title = root.querySelector<HTMLElement>("h2")!;
+    const image = root.querySelector<HTMLImageElement>(
+      "img.md-document-image"
+    )!;
+    const host = root.querySelector<HTMLElement>(".md-echarts-host")!;
+    const svg = root.querySelector<SVGSVGElement>("svg")!;
+    const mermaidSvg = root.querySelector<SVGSVGElement>(
+      ".mermaid svg"
+    )!;
+    expect(title.getAttribute("style")).toBeNull();
+    expect(image.style.width).toBe("720px");
+    expect(image.style.height).toBe("540px");
+    expect(host.style.width).toBe("616px");
+    expect(host.style.height).toBe("440px");
+    expect(svg.style.width).toBe("616px");
+    expect(svg.style.height).toBe("440px");
+    expect(mermaidSvg.style.width).toBe("540px");
+    expect(mermaidSvg.style.height).toBe("360px");
+  });
+});

apps/web/tests/sample-markdown.test.ts

@@ -0,0 +1,81 @@
+import { inflateSync } from "node:zlib";
+import { describe, expect, it } from "vitest";
+import { sampleMarkdown } from "../src/sample-markdown";
+
+function readPngDimensions(base64: string) {
+  const png = Buffer.from(base64, "base64");
+  expect(png.subarray(0, 8)).toEqual(
+    Buffer.from([137, 80, 78, 71, 13, 10, 26, 10])
+  );
+  const width = png.readUInt32BE(16);
+  const height = png.readUInt32BE(20);
+  const bitDepth = png[24] ?? 0;
+  const colorType = png[25] ?? 0;
+  const samplesPerPixel =
+    colorType === 0 || colorType === 3
+      ? 1
+      : colorType === 2
+        ? 3
+        : colorType === 4
+          ? 2
+          : 4;
+  const idatParts: Buffer[] = [];
+  let offset = 8;
+  while (offset + 12 <= png.length) {
+    const length = png.readUInt32BE(offset);
+    const type = png.toString("ascii", offset + 4, offset + 8);
+    if (type === "IDAT") {
+      idatParts.push(
+        png.subarray(offset + 8, offset + 8 + length)
+      );
+    }
+    offset += 12 + length;
+  }
+  const decoded = inflateSync(Buffer.concat(idatParts));
+  const rowBytes = Math.ceil(
+    (width * bitDepth * samplesPerPixel) / 8
+  );
+  expect(decoded.length).toBe((rowBytes + 1) * height);
+  return { width, height };
+}
+
+describe("默认示例 Markdown", () => {
+  it("仅保留一张网络图片并提供三种 Base64 图片尺寸", () => {
+    expect(
+      sampleMarkdown.match(/https?:\/\/[^\s)]+/gu)
+    ).toHaveLength(1);
+    expect(
+      sampleMarkdown.match(/data:image\/png;base64,/gu)
+    ).toHaveLength(3);
+    expect(sampleMarkdown).toContain("1600×900");
+    expect(sampleMarkdown).toContain("900×1800");
+    expect(sampleMarkdown).toContain("1200×880");
+  });
+
+  it("所有内嵌 PNG 均可完整解压且尺寸符合描述", () => {
+    const images = Array.from(
+      sampleMarkdown.matchAll(
+        /data:image\/png;base64,([A-Za-z0-9+/=]+)/gu
+      ),
+      (match) => readPngDimensions(match[1] ?? "")
+    );
+    expect(images).toEqual([
+      { width: 1600, height: 900 },
+      { width: 900, height: 1800 },
+      { width: 1200, height: 880 }
+    ]);
+  });
+
+  it("覆盖 Mermaid、ECharts 分档和串行媒体场景", () => {
+    expect(
+      sampleMarkdown.match(/```mermaid/gu)
+    ).toHaveLength(3);
+    expect(
+      sampleMarkdown.match(/```echarts/gu)
+    ).toHaveLength(4);
+    expect(sampleMarkdown).toContain("height: 40mm");
+    expect(sampleMarkdown).toContain("height: 58mm");
+    expect(sampleMarkdown).toContain("height: 85mm");
+    expect(sampleMarkdown).toContain("## 串行媒体块");
+  });
+});

deploy/README.md

@@ -37,7 +37,7 @@ docker compose -f deploy\compose.yaml down
 可以直接指定版本化镜像名称构建：
 
 ```powershell
-$env:MD_TO_PDF_IMAGE = 'yixiong/md-to-pdf:v0.4.1'
+$env:MD_TO_PDF_IMAGE = 'yixiong/md-to-pdf:v0.4.5'
 docker compose -f deploy\compose.yaml build
 ```
 
@@ -47,13 +47,13 @@ docker compose -f deploy\compose.yaml build
 已经保留同版本系列的已验证镜像，可在内网或软件源较慢时复用其运行层：
 
 ```powershell
-$env:MD_TO_PDF_IMAGE = 'yixiong/md-to-pdf:v0.4.1'
+$env:MD_TO_PDF_IMAGE = 'yixiong/md-to-pdf:v0.4.5'
 $env:MD_TO_PDF_RUNTIME_BASE_IMAGE = 'yixiong/md-to-pdf:v0.3.1'
 $env:MD_TO_PDF_REUSE_PLAYWRIGHT_RUNTIME = '1'
 docker compose -f deploy\compose.yaml build
 ```
 
-复用模式会校验基础镜像中存在 Chromium，再覆盖 v0.4.1 应用代码和生产
+复用模式会校验基础镜像中存在 Chromium，再覆盖 v0.4.5 应用代码和生产
 依赖。正式跨机器构建仍建议使用默认完整路径。
 
 ## 主题挂载

docs/PROGRESS.md

@@ -1,6 +1,6 @@
 # Markdown PDF 导出器进度
 
-最后更新：2026-07-27
+最后更新：2026-07-28
 
 ## 1. 当前概况
 
@@ -38,6 +38,17 @@ ec48bce chore: 初始化项目骨架
 `v0.4.2` 为仅面向桌面端的维护版本：移除 Windows 原生应用菜单栏；
 Web/Compose 发布仍保持 `v0.4.1`。
 
+`v0.4.3` 将桌面发行包迁移为标准 NSIS 安装向导，并使用全英文、无空格、
+包含版本与平台的安装包文件名；Web/Compose 发布仍保持 `v0.4.1`。
+
+`v0.4.4` 仅精简 Electron 桌面发行包的语言资源，保留简体中文和英文；
+Web/Compose 发布仍保持 `v0.4.1`。
+
+`v0.4.5` 同步更新 Web 与 Desktop：新增新建/保存 Markdown、桌面文件
+关联、窗口状态恢复、自定义主题目录和收纳式“更多”菜单；Web 明确取消
+本地素材目录。图片、Mermaid 与 ECharts 的分页算法统一为按文档顺序
+串行计算的媒体块回填，每个媒体元素至多重排一次，标题保持原尺寸。
+
 ## 2. 已完成
 
 ### 2.1 项目骨架
@@ -408,9 +419,60 @@ Web/Compose 发布仍保持 `v0.4.1`。
 - 该维护版本只重新生成桌面安装包和免安装 ZIP；Web/Compose 镜像继续
   使用已验证的 `v0.4.1`。
 
+### 3.16 v0.4.3 标准 Windows 安装向导
+
+- 桌面发行链路由 Electron Forge Squirrel 迁移到 electron-builder
+  26.15.3 的 NSIS assisted installer。
+- 安装向导提供当前用户/所有用户安装选项、安装目录选择、安装进度和完成
+  页面；主程序继续使用 `md-to-pdf.exe`。
+- 正式安装包固定命名为
+  `md-to-pdf-0.4.3-x86_64-Setup.exe`，免安装包命名为
+  `md-to-pdf-0.4.3-x86_64.zip`。
+- 项目自有 `build/installer.nsh` 显式创建桌面和开始菜单快捷方式，
+  安装完成后直接启动主程序，不依赖 `.lnk`。
+- 卸载时显式清理桌面快捷方式、开始菜单快捷方式及其目录。
+- 安装包和校验文件作为 Gitea `v0.4.3` Release 附件发布，不写入 Git
+  历史。
+
+### 3.17 v0.4.4 桌面语言包精简
+
+- Electron 发行包只保留 `zh-CN` 和 `en-US` 两种 Chromium 语言资源。
+- 不裁剪 ICU、ANGLE、Direct3D、Dawn、SwiftShader 或其他 Chromium
+  运行时组件，保证桌面预览与 PDF 导出在不同图形环境下的可靠性。
+- 本版本只重新生成桌面安装包和免安装 ZIP；Web/Compose 发布继续保持
+  `v0.4.1`。
+
+### 3.18 v0.4.5 文档工作流与媒体分页
+
+- Web 与 Desktop 均支持新建 Markdown；未保存时使用“未命名文档”状态，
+  不显示伪造源文件名，并允许直接导出 PDF。
+- Web 保存使用浏览器下载；Desktop 使用原生另存为。默认文件名优先取
+  第一个一级标题，没有一级标题时取首行可见文本，并清理 Windows 非法
+  字符、保留名和末尾空格或句点。
+- “打开 Markdown”继续作为顶部独立强操作；新建、保存及桌面自定义主题
+  目录收纳到“更多”菜单，Web 不再显示本地素材目录入口。
+- Windows 安装包注册 `.md` 和 `.markdown` 文件关联；系统打开文件会
+  转交给现有单实例窗口并自动加载。
+- Desktop 监听窗口位置、尺寸和最大化变化，延迟写入完整状态；退出前
+  刷新待写状态。下次启动按当前显示器工作区限制尺寸并修正坐标，避免
+  多显示器断开后窗口落在屏幕外。
+- Desktop 会建立自定义主题目录，“更多”菜单可直接在资源管理器打开；
+  目录允许留空，放入合法主题后由共享主题注册器读取。
+- 图片、Mermaid 和 ECharts 统一视为带标题的媒体块。分页按 DOM 文档
+  顺序串行处理，每个媒体元素只允许一次回填或缩放重排。
+- 图片基准高度按原尺寸先收缩到内容限宽后计算；媒体块只有在上一页空白
+  与所需空间比例达到阈值时才尝试回填。缩放只作用于图片或图表内容，
+  标题保持原字号和自然高度。
+- ECharts 在分页前冻结为 SVG 图片，三类媒体共享回填决策与边界检查；
+  无法安全回填时仍移至下一页，保证顺序、不跨页且不覆盖后续内容。
+- 默认示例仅保留一张网络图片，并新增有效 Base64 横图、不同尺寸图片、
+  Mermaid 和 ECharts，用于观察媒体分页、标题配对和渲染效果。
+- 根 README、Desktop README、四个工作区包 README、进度文档和发布
+  规范随版本同步更新。
+
 ## 4. 已执行验证
 
-2026-07-27 在当前完整工作区成功执行：
+2026-07-28 在当前完整工作区成功执行：
 
 ```text
 npm test
@@ -423,16 +485,45 @@ git diff --check
 
 - ECharts 围栏测试：36 项通过；
 - 共享配置测试：9 项通过；
-- 渲染器测试：10 项通过；
-- 应用服务测试：5 项通过；
-- 前端测试：67 项通过；
+- 渲染器测试：12 项通过；
+- 应用服务测试：9 项通过；
+- 前端测试：87 项通过；
 - 后端测试：29 项通过；
-- 桌面端测试：7 项通过；
-- 全项目共 171 项测试通过；
+- 桌面端测试：20 项通过；
+- 全项目共 202 项测试通过；
 - 全项目类型检查通过；
 - 生产构建通过；
 - `git diff --check` 通过。
 
+`v0.4.5` 双端与媒体分页验收结果：
+
+- 正式镜像 `yixiong/md-to-pdf:v0.4.5` 已完成多阶段构建，镜像内容 ID
+  为 `sha256:0703c3762cd0e4e551ce44732b064a938c2095eb331a22e28861a148fe520354`；
+  Compose 已强制替换为正式镜像并健康运行在 `http://localhost:8080`。
+- 正式镜像 PDF 冒烟请求返回 HTTP 200，生成 1 页、96,661 字节 PDF，
+  Mermaid 与 ECharts 错误数均为 0。
+- 默认示例在 Web 快速预览与精确预览中均为 10 页；12 个媒体块均只
+  出现一次，全部标题正确配对，无重叠、越界、解码或图表错误。
+- 容器生成 `output/pdf/v0.4.5-media-pagination-rc.pdf`，共 10 页、
+  928,803 字节；Mermaid 与 ECharts 错误数均为 0，逐页视觉检查通过。
+- Desktop 新建、输入、默认标题文件名保存、原生 PDF 导出均通过；
+  `output/桌面保存验收.md` 内容正确，Desktop README 导出 PDF 为 5 页。
+- 从第二实例系统打开 `README.md` 时保持单窗口并自动加载；自定义主题
+  目录能够打开且可识别已有主题。
+- 窗口最大化变化约 2 秒后写入状态；重启恢复最大化。窗口位置与尺寸
+  测试覆盖屏幕越界修正、最小尺寸、原子写入和损坏状态回退。
+- 正式 NSIS 安装包为 `md-to-pdf-0.4.5-x86_64-Setup.exe`，
+  94,998,489 字节，SHA-256 为
+  `9CBD6362E15AA745185805E753D5A7749434E0E142E6CE0F66463E6A19468F1D`。
+- 免安装包为 `md-to-pdf-0.4.5-x86_64.zip`，132,477,245 字节，
+  SHA-256 为
+  `97B2D44E72F626A3396E5AB5B330FFB7F9BECAF945A1707808C876940A82E850`。
+- 正式目录版主程序版本为 `0.4.5`，只包含 `zh-CN` 和 `en-US` 语言包，
+  Authenticode 状态为未签名，启动后应用与渲染进程均正常响应。
+- 本机当前用户安装已从 `0.4.3` 原位升级到 `0.4.5`；卸载注册信息、
+  桌面与开始菜单快捷方式、`.md` 和 `.markdown` 打开注册均验证通过，
+  安装版应用启动正常。
+
 Electron 桌面端第一阶段验证结果：
 
 - Electron 43.2.0 应用窗口成功加载现有 React/Vite 界面，标题旁正确显示
@@ -612,9 +703,47 @@ ECharts 第二阶段浏览器与 PDF 验证结果：
   `59DA57522C99EB6B16A9591AFDEC349B785BF9B76950504B314273520152D41B`，
   Authenticode 状态为未签名。
 
+2026-07-27 已完成 `v0.4.3` 标准安装向导验证：
+
+- NSIS 中文辅助安装向导正确显示安装范围和安装目录选择，版本显示为
+  `0.4.3`。
+- 当前用户安装成功，安装目录为
+  `%LOCALAPPDATA%\Programs\md-to-pdf`，卸载项版本为 `0.4.3`。
+- 桌面和开始菜单快捷方式均存在，实际目标均为安装目录中的
+  `md-to-pdf.exe`；从开始菜单快捷方式启动成功。
+- 静默卸载返回 0，安装目录、桌面快捷方式和开始菜单目录全部清理；
+  随后重新安装成功，最终本机保持已安装状态。
+- 正式安装包为 `md-to-pdf-0.4.3-x86_64-Setup.exe`，
+  103,346,230 字节，SHA-256 为
+  `C027B4AC604889C7E7E00BA3CE08A12616312BC9250268775B1B7B578A7C4817`，
+  Authenticode 状态为未签名。
+- 免安装包为 `md-to-pdf-0.4.3-x86_64.zip`，143,784,617 字节，
+  SHA-256 为
+  `91BED88A7CB623B98383408D5553D80A6135FB94F7FE2D77A5FCED339CCF5BC6`。
+
+2026-07-27 已完成 `v0.4.4` 桌面语言包精简验证：
+
+- 目录版只包含 `zh-CN.pak` 和 `en-US.pak`，语言资源从 55 个、
+  48,911,653 字节降为 2 个、1,137,843 字节。
+- 目录版总大小从 378,084,454 字节降为 330,310,644 字节，减少
+  47,773,810 字节；Chromium 图形与软件渲染后备组件均保持完整。
+- Windows 主程序版本为 `0.4.4`，目录版成功启动并保持应用、GPU、
+  渲染器等 4 个 Electron 进程正常运行。
+- 正式安装包为 `md-to-pdf-0.4.4-x86_64-Setup.exe`，94,991,759 字节，
+  SHA-256 为
+  `0827FD87A8EEC8B034DF738909CB6A20231245B507AE4A0BAA579AFA03A942DE`，
+  Authenticode 状态为未签名。
+- 免安装包为 `md-to-pdf-0.4.4-x86_64.zip`，132,470,241 字节，
+  SHA-256 为
+  `D6CDB8DAE30676BAB6B2A037567164476AD294588B102A6FBBE9458ABCE5CCC0`。
+
 ## 5. 当前注意事项
 
 - `output/` 可能包含本地 PDF 验证产物，已被 Git 忽略，不得提交。
+- 已确认分页预览 iframe 内点击超链接会在 iframe 内执行导航，可能将当前
+  预览替换为空白页。该问题不阻塞 `v0.4.5`，计划在 `v0.4.6` 统一处理：
+  区分文档内锚点与外部链接、阻止危险协议，并为外部链接使用受控的新窗口
+  或系统浏览器打开策略。
 - `apps/web/src/App.tsx` 负责分页 iframe 生命周期和父页面消息处理。
 - `apps/web/src/use-markdown-render.ts` 负责 Markdown 防抖请求、取消和
   渲染错误状态。
@@ -657,12 +786,22 @@ ECharts 第二阶段浏览器与 PDF 验证结果：
   目录读取；远程图片仅保留有界内存缓存。
 - 桌面端已通过进程内共享服务实现离线 Markdown 渲染、主题读取和 PDF
   导出，不依赖 Fastify 或本地 HTTP Server。
-- v0.4.0 AIO 容器已经通过 Docker Desktop 构建、端到端和浏览器验证，
-  当前 Compose 容器保持运行。
+- `v0.4.5` AIO 正式镜像已经通过 Docker Desktop 构建、PDF 冒烟和
+  Compose 健康检查，当前 Compose 容器保持运行。
 
 ## 6. 推荐接手顺序
 
-### 阶段一：导出配置扩展
+### 阶段一：v0.4.6 超链接导航
+
+- 在快速预览 iframe 中统一拦截链接点击，避免外部页面替换分页预览；
+- 文档内 `#anchor` 保持在当前预览中定位，并兼容分页后的标题锚点；
+- `http:`、`https:`、`mailto:` 等允许协议通过受控新窗口或桌面系统
+  浏览器打开；
+- 拒绝 `javascript:`、`file:`、未知协议及未授权本地资源；
+- Web 与 Desktop 共用链接分类规则，各平台只实现打开动作适配；
+- 增加快速预览、精确预览和 Desktop 的链接行为测试。
+
+### 阶段二：导出配置扩展
 
 - Front Matter 元数据覆盖；
 - 浏览器本地配置预设；

package.json

@@ -1,6 +1,6 @@
 {
   "name": "md-to-pdf",
-  "version": "0.4.2",
+  "version": "0.4.5",
   "private": true,
   "description": "可配置、可主题化的 Markdown PDF 导出工具",
   "workspaces": [

packages/application/README.md

@@ -0,0 +1,46 @@
+# @md-to-pdf/application
+
+Web Server 与 Electron Desktop 共用的应用服务层，组合
+`@md-to-pdf/core` 和 `@md-to-pdf/renderer`，统一处理 Markdown 渲染、
+主题发现、主题资源和图片资源。Fastify 与 Electron IPC 只负责传输和
+平台能力适配。
+
+## 目录结构
+
+```text
+src/
+  application-service.ts  渲染、主题和资源用例入口
+  image-resources.ts      本地、Base64 与受限远程图片处理
+  theme-registry.ts       内置及自定义主题扫描、校验与缓存
+  index.ts                公共导出入口
+tests/
+  application-service.test.ts
+  image-resources.test.ts
+```
+
+## 使用
+
+```ts
+import { createApplicationService } from "@md-to-pdf/application";
+
+const service = createApplicationService({
+  bundledRoot,
+  localRoot
+});
+
+const themes = await service.listThemes();
+const document = await service.render(request);
+```
+
+Web 端通过 `apps/server` 的 HTTP API 调用；桌面端在主进程中创建同一
+服务，并通过受限 IPC 暴露给渲染进程。Web 默认不接收本地素材目录，
+Desktop 才会以 Markdown 所在目录为边界解析相对资源。
+
+## 开发与验证
+
+```powershell
+npm run dev -w @md-to-pdf/application
+npm run test -w @md-to-pdf/application
+npm run typecheck -w @md-to-pdf/application
+npm run build -w @md-to-pdf/application
+```

packages/core/README.md

@@ -0,0 +1,47 @@
+# @md-to-pdf/core
+
+跨 Web、Server、Desktop 和渲染器共享的纯数据模型与校验规则。该包不
+依赖浏览器、Electron 或 Fastify，负责保证各运行端使用同一份协议。
+
+## 目录结构
+
+```text
+src/
+  document.ts       Markdown 文档、分页载荷、结果与耗时模型
+  export-config.ts  纸张、边距、页眉页脚、页码与图表配置
+  theme.ts          主题清单、主题能力与 CSS 载荷模型
+  index.ts          公共导出入口
+tests/
+  document.test.ts
+  export-config.test.ts
+```
+
+## 使用
+
+```ts
+import {
+  createPagedDocumentPayload,
+  defaultExportConfig,
+  exportConfigSchema
+} from "@md-to-pdf/core";
+
+const config = exportConfigSchema.parse(defaultExportConfig);
+const payload = createPagedDocumentPayload({
+  document,
+  fileName: "example.md",
+  themeCss,
+  exportConfig: config
+});
+```
+
+新增跨端字段时，应先在这里定义类型、默认值、Zod 校验和兼容迁移，再由
+各适配层消费，避免 Web 与 Desktop 分别维护协议。
+
+## 开发与验证
+
+```powershell
+npm run dev -w @md-to-pdf/core
+npm run test -w @md-to-pdf/core
+npm run typecheck -w @md-to-pdf/core
+npm run build -w @md-to-pdf/core
+```

packages/markdown-echarts/README.md

@@ -6,6 +6,24 @@
 该包不依赖 React、Paged.js 或特定 PDF 引擎。宿主可以将生成的
 HTML 用于网页预览，也可以在图表完成渲染后交给 Chromium 输出 PDF。
 
+## 目录结构
+
+```text
+src/
+  markdown-it-plugin.ts  ECharts YAML 围栏与错误占位
+  parse-yaml.ts          受限 YAML 解析
+  protocol.ts            围栏协议与基础校验
+  security-policy.ts     URL、函数、原型和规模安全策略
+  semantic-validator.ts  系列数据与坐标系语义校验
+  dom-contract.ts        宿主与浏览器运行时共用的 DOM 协议
+  browser.ts             浏览器入口
+  browser/               ECharts 按需加载、渲染和 SVG 冻结
+  index.ts               Markdown 侧公共导出
+styles/
+  echarts.css            图表、标题和错误占位样式
+tests/                   解析、安全、语义、插件和真实 SVG 测试
+```
+
 ## 基本语法
 
 ````markdown
@@ -289,6 +307,15 @@ Chromium `page.pdf()`。
 3. 注册该系列的语义验证器；
 4. 增加有效、缺少数据、错误数据结构和真实 SVG 渲染测试。
 
+## 开发与验证
+
+```powershell
+npm run dev -w @md-to-pdf/markdown-echarts
+npm run test -w @md-to-pdf/markdown-echarts
+npm run typecheck -w @md-to-pdf/markdown-echarts
+npm run build -w @md-to-pdf/markdown-echarts
+```
+
 参考：
 
 - [ECharts 配置参考](https://echarts.apache.org/en/option.html)

packages/renderer/README.md

@@ -0,0 +1,46 @@
+# @md-to-pdf/renderer
+
+将 Markdown 转换为统一、安全的 `#write` HTML 文档。Web 预览、服务端
+PDF 和桌面端 PDF 均通过应用服务复用本包，不维护第二套 Markdown 解析
+逻辑。
+
+## 目录结构
+
+```text
+src/
+  render-markdown.ts  Front Matter、Markdown 扩展、安全过滤与元数据
+  index.ts            公共导出入口
+tests/
+  render-markdown.test.ts
+```
+
+## 支持能力
+
+- 标题锚点、表格、任务列表、脚注和代码高亮；
+- KaTeX 数学公式；
+- Mermaid 安全占位；
+- `@md-to-pdf/markdown-echarts` ECharts YAML 围栏；
+- 图片标题 DOM 与资源引用收集；
+- `sanitize-html` 白名单过滤和统一 `<article id="write">` 输出。
+
+## 使用
+
+```ts
+import { renderMarkdown } from "@md-to-pdf/renderer";
+
+const result = renderMarkdown("# 示例", {
+  language: "zh-CN"
+});
+```
+
+实际应用优先通过 `@md-to-pdf/application` 调用，以便同时完成主题和图片
+资源处理。
+
+## 开发与验证
+
+```powershell
+npm run dev -w @md-to-pdf/renderer
+npm run test -w @md-to-pdf/renderer
+npm run typecheck -w @md-to-pdf/renderer
+npm run build -w @md-to-pdf/renderer
+```