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/types/icon.ts

@@ -0,0 +1,16 @@
+export interface IconMetadata {
+  /** 图标名称（小写，如 "openai"） */
+  name: string;
+  /** 显示名称（如 "OpenAI"） */
+  displayName: string;
+  /** 分类（如 "ai-provider", "cloud", "tool"） */
+  category: string;
+  /** 搜索关键词 */
+  keywords: string[];
+  /** 默认颜色 */
+  defaultColor?: string;
+}
+
+export interface IconPreset {
+  [key: string]: IconMetadata;
+}

src/types/index.ts

@@ -24,6 +24,10 @@ export interface Provider {
   enabled?: boolean;
   /** Whether this provider is the currently active one for Kimi Code. */
   active?: boolean;
+  /** Manually selected brand icon key (from extracted icons). */
+  icon?: string | null;
+  /** Custom icon color; falls back to icon metadata defaultColor. */
+  icon_color?: string | null;
   /** Extra agent-specific provider fields preserved across edits. */
   raw_other?: unknown;
 }