feat: 闲言APP v0.9.1 — 编辑器全面重写 + 迷你编辑器

- 标准编辑器: freezed数据模型 + 5Tab工具栏 + 多图层管理 + 文字增强 + 背景系统 + 导出链路
- 迷你编辑器: 极简6项功能(文字/字号/颜色/背景/预览/导出) + 三种调用方式(全屏/半屏/内嵌)
- 共享组件: GlassSlider/ColorPicker/FontPicker/TipsView
- 服务层: ExportService/ImageImportService/FontService/XycardService
- 设计系统: 统一主题令牌 + Liquid Glass风格

lib/app/app.dart

@@ -0,0 +1,137 @@
+// ============================================================
+// 闲言APP — 应用根组件
+// 创建时间: 2026-04-20
+// 更新时间: 2026-04-20
+// 作用: MaterialApp.router + Riverpod 主题管理 + GlassTheme + flutter_animate
+// 上次更新: 集成 GlassTheme 液态玻璃动态主题
+// ============================================================
+
+import 'package:flutter/material.dart';
+import 'package:flutter_animate/flutter_animate.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:liquid_glass_widgets/liquid_glass_widgets.dart';
+
+import '../core/router/app_router.dart';
+import '../core/theme/app_theme.dart';
+import '../core/storage/kv_storage.dart';
+
+/// 主题模式 Provider (日/夜/系统)
+final themeModeProvider = StateNotifierProvider<ThemeModeNotifier, ThemeMode>(
+  (ref) => ThemeModeNotifier(),
+);
+
+/// 主题模式状态管理
+class ThemeModeNotifier extends StateNotifier<ThemeMode> {
+  ThemeModeNotifier() : super(_initMode());
+
+  static ThemeMode _initMode() {
+    final index = KvStorage.themeModeIndex;
+    switch (index) {
+      case 1:
+        return ThemeMode.light;
+      case 2:
+        return ThemeMode.dark;
+      default:
+        return ThemeMode.system;
+    }
+  }
+
+  void toLight() {
+    state = ThemeMode.light;
+    KvStorage.setThemeModeIndex(1);
+  }
+
+  void toDark() {
+    state = ThemeMode.dark;
+    KvStorage.setThemeModeIndex(2);
+  }
+
+  void toSystem() {
+    state = ThemeMode.system;
+    KvStorage.setThemeModeIndex(0);
+  }
+
+  void toggle() {
+    if (state == ThemeMode.light) {
+      toDark();
+    } else {
+      toLight();
+    }
+  }
+
+  void setMode(ThemeMode mode) {
+    state = mode;
+    switch (mode) {
+      case ThemeMode.light:
+        KvStorage.setThemeModeIndex(1);
+      case ThemeMode.dark:
+        KvStorage.setThemeModeIndex(2);
+      default:
+        KvStorage.setThemeModeIndex(0);
+    }
+  }
+}
+
+/// 闲言 App 根组件
+class XianyanApp extends ConsumerWidget {
+  const XianyanApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final themeMode = ref.watch(themeModeProvider);
+
+    Animate.defaultDuration = 300.ms;
+    Animate.defaultCurve = Curves.easeOutCubic;
+
+    return ScreenUtilInit(
+      designSize: const Size(390, 844),
+      minTextAdapt: true,
+      splitScreenMode: true,
+      builder: (context, child) {
+        return GlassTheme(
+          data: const GlassThemeData(
+            light: GlassThemeVariant(
+              settings: GlassThemeSettings(
+                thickness: 30.0,
+                blur: 3.0,
+                refractiveIndex: 1.65,
+                lightIntensity: 1.2,
+                ambientStrength: 0.6,
+                saturation: 1.2,
+              ),
+            ),
+            dark: GlassThemeVariant(
+              settings: GlassThemeSettings(
+                thickness: 40.0,
+                blur: 5.0,
+                lightIntensity: 1.5,
+                refractiveIndex: 1.2,
+                saturation: 1.1,
+              ),
+            ),
+          ),
+          child: MaterialApp.router(
+            title: '闲言',
+            debugShowCheckedModeBanner: false,
+
+            theme: AppTheme.light,
+            darkTheme: AppTheme.dark,
+            themeMode: themeMode,
+
+            routerConfig: appRouter,
+
+            builder: (context, widget) {
+              return MediaQuery(
+                data: MediaQuery.of(
+                  context,
+                ).copyWith(textScaler: TextScaler.noScaling),
+                child: widget!,
+              );
+            },
+          ),
+        );
+      },
+    );
+  }
+}

lib/app/app_export.dart

@@ -0,0 +1,9 @@
+// ============================================================
+// 闲言APP — 应用层导出
+// 创建时间: 2026-04-20
+// 更新时间: 2026-04-20
+// 作用: 统一导出应用层所有模块
+// 上次更新: 初始创建
+// ============================================================
+
+export 'app.dart';