feat: v0.4.0 - provider icon system, settings modal & polish

- Add provider icon system with extracted icon library (cc-switch based)

- Persist icon and icon_color in SQLite and config.toml

- Add Settings modal (theme / language / update check / silent download)

- Add useTheme and useUpdateCheck hooks

- Add provider icon picker (IconPicker) with search and grid

- Fix icon frame 2-layer color difference in ProviderEdit

- Dashboard heatmap and daily usage improvements

- Sessions page polish and adaptive layout

- Bump version to 0.4.0

src/i18n/zh.ts

@@ -72,6 +72,13 @@ export const zhTranslations = {
   readOnlyPreview: "可编辑 JSON",
   apply: "应用",
   invalidJson: "JSON 格式错误：{message}",
+  clickToSelectIcon: "点击选择图标",
+  clickToChangeIcon: "点击更换图标",
+  selectIcon: "选择图标",
+  clearIcon: "清除图标",
+  iconPickerSearch: "搜索图标",
+  iconPickerSearchPlaceholder: "输入图标名称...",
+  iconPickerNoResults: "未找到匹配的图标",
 
   // Agent / target
   target: "目标",
@@ -198,6 +205,30 @@ export const zhTranslations = {
   zh: "中文",
   en: "English",
 
+  // Theme & Settings
+  themeLight: "浅色",
+  themeDark: "深色",
+  themeAuto: "跟随系统",
+  settings: "设置",
+  settingsTitle: "设置",
+  settingsAppearance: "外观",
+  settingsUpdates: "更新",
+  settingsAbout: "关于",
+  checkUpdate: "检查更新",
+  checking: "检查中…",
+  upToDate: "已是最新版本",
+  updateAvailable: "有新版本可用",
+  currentVersion: "当前版本",
+  latestVersion: "最新版本",
+  downloadUpdate: "下载更新",
+  downloading: "下载中…",
+  downloadComplete: "下载完成，点击安装",
+  install: "安装",
+  updateCheckFailed: "检查更新失败",
+  lastChecked: "上次检查",
+  appDescription: "Windows 桌面端 LLM 供应商配置管理器",
+  referenceProject: "引用项目",
+
   // Validation errors
   emptyProviderName: "供应商名称为空",
   duplicateProviderName: "重复的供应商名称：{0}",