chore: 初始化脚手架 — sunny_mochi 企业级 Flutter 模板

Core 基础设施：Flavor 三包体系、Drift+SQLCipher 加密数据库 7 拦截器 Dio 网络栈、CrashReporter 崩溃日志、Sealed Failure 错误体系 5 色板主题系统、Auth 认证骨架（Clean Architecture）、Dev Panel、Mock Adapter 通过验证：flutter analyze（0 errors）、flutter test（全绿）、staging APK 74.8MB
2026-05-14 12:51:05 +08:00
commit 61017f1c39
204 changed files with 15386 additions and 0 deletions
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+import 'package:flutter/material.dart';
+
+/// 全屏/局部 loading 遮罩。
+///
+/// 用法：
+/// ```dart
+/// LoadingOverlay(
+///   loading: _isLoading,
+///   child: MyWidget(),
+/// )
+/// ```
+class LoadingOverlay extends StatelessWidget {
+  const LoadingOverlay({
+    super.key,
+    required this.child,
+    this.loading = false,
+    this.label,
+  });
+
+  final Widget child;
+  final bool loading;
+  final String? label;
+
+  @override
+  Widget build(BuildContext context) {
+    return Stack(
+      children: [
+        child,
+        if (loading)
+          Positioned.fill(
+            child: ColoredBox(
+              color: Colors.black26,
+              child: Center(
+                child: Card(
+                  child: Padding(
+                    padding: const EdgeInsets.symmetric(
+                        horizontal: 32, vertical: 24),
+                    child: Column(
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        const CircularProgressIndicator(),
+                        if (label != null) ...[
+                          const SizedBox(height: 12),
+                          Text(label!,
+                              style: Theme.of(context).textTheme.bodySmall),
+                        ],
+                      ],
+                    ),
+                  ),
+                ),
+              ),
+            ),
+          ),
+      ],
+    );
+  }
+}