release: 发布 v0.5.0

新增共享 Preview Engine，统一 Web 连续预览、快速分页、Playwright PDF 与 Electron PDF；实现稳定前缀复用和修改位置后的增量分页，保留媒体块按文档顺序串行回填与单次重排。

完善跨端链接与桌面文档工作流：Web 受控处理锚点和 HTTP/HTTPS 外链；Desktop 支持本地路径、file URI、系统协议、多窗口、同文件单例、Markdown 当前或新窗口打开，以及聚焦时外部文件变化提示。

统一四套内置主题名称并默认使用 Typora Github；修复连续预览双滚动条、ECharts 尺寸、PDF 本地链接、围栏代码块 Typora DOM 与重复行内样式；桌面发行链强制完整重建内嵌 Web，避免安装包携带陈旧资源。

发布 Web/Compose 与 Windows NSIS/ZIP：镜像 yixiong/md-to-pdf:v0.5.0 已健康部署；NSIS SHA-256 为 60992D1FDCA513F46346C78478537EB4159D8C0E76B41ECF3CDC25BE77707D92，ZIP SHA-256 为 D74F82293FB67126E583546CBA894569EFC9A0B1B6343FAC648CCC95F1D188D8，本机安装版已升级至 v0.5.0。

验证：全项目 238 项测试通过，类型检查、生产构建和 git diff --check 通过；Web 快速/连续/精确预览、Compose、Desktop 多窗口、窗口状态、文件关联、链接与代码块均完成真实环境验收。

packages/application/src/image-resources.ts

@@ -2,6 +2,7 @@ import { lookup } from "node:dns/promises";
 import { readFile, realpath, stat } from "node:fs/promises";
 import { isIP } from "node:net";
 import path from "node:path";
+import { fileURLToPath } from "node:url";
 import { extractMarkdownImageSources } from "@md-to-pdf/renderer";
 
 export const MAXIMUM_IMAGE_COUNT = 50;
@@ -22,6 +23,7 @@ export interface MarkdownImageResource {
 
 export interface ImageResolutionContext {
   localRoot?: string;
+  allowUnrestrictedLocalFiles?: boolean;
 }
 
 export interface ResolvedMarkdownImages {
@@ -313,6 +315,46 @@ async function loadLocalImage(root: string, source: string) {
   };
 }
 
+function decodeUnrestrictedLocalPath(source: string) {
+  if (/^file:/iu.test(source)) {
+    try {
+      return fileURLToPath(new URL(source));
+    } catch {
+      throw new Error("file: 图片路径格式无效");
+    }
+  }
+  const pathOnly = source.split(/[?#]/u, 1)[0] ?? "";
+  try {
+    return decodeURIComponent(pathOnly);
+  } catch {
+    throw new Error("图片路径 URL 编码无效");
+  }
+}
+
+async function loadUnrestrictedLocalImage(
+  root: string,
+  source: string
+) {
+  const decoded = decodeUnrestrictedLocalPath(source);
+  const target =
+    path.isAbsolute(decoded) || /^[a-z]:[\\/]/iu.test(decoded)
+      ? path.normalize(decoded)
+      : path.resolve(root, decoded);
+  const realTarget = await realpath(target);
+  const targetStat = await stat(realTarget);
+  if (!targetStat.isFile()) {
+    throw new Error("图片资源不是文件");
+  }
+  if (targetStat.size > MAXIMUM_IMAGE_BYTES) {
+    throw new Error("本地图片超过单文件大小限制");
+  }
+  const content = await readFile(realTarget);
+  return {
+    content,
+    contentType: detectImageContentType(content)
+  };
+}
+
 function parseUploadedResources(value: unknown) {
   if (value === undefined) {
     return new Map<string, LoadedImage>();
@@ -413,12 +455,26 @@ export function createImageResourceResolver(
         if (/^https?:\/\//iu.test(source)) {
           image = await loadRemote(source);
         } else {
-          const normalized = normalizeDocumentAssetPath(source);
-          const uploadedImage = uploaded.get(normalized);
+          let normalized: string | undefined;
+          try {
+            normalized = normalizeDocumentAssetPath(source);
+          } catch (error) {
+            if (!context.allowUnrestrictedLocalFiles) {
+              throw error;
+            }
+          }
+          const uploadedImage = normalized
+            ? uploaded.get(normalized)
+            : undefined;
           if (uploadedImage) {
             image = uploadedImage;
           } else if (context.localRoot) {
-            image = await loadLocalImage(context.localRoot, source);
+            image = context.allowUnrestrictedLocalFiles
+              ? await loadUnrestrictedLocalImage(
+                  context.localRoot,
+                  source
+                )
+              : await loadLocalImage(context.localRoot, source);
           } else {
             throw new Error("未提供对应素材目录");
           }