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

README_EN.md

@@ -341,6 +341,8 @@ A: The code doesn't depend on Windows-only APIs, but `tauri.conf.json` only targ
 
 The usage dashboard and session manager are ported from [kimicode-dashboard](https://github.com/JochenYang/kimicode-dashboard) (MIT License, © JochenYang). The original project implements local token usage analytics and session management for Kimi Code CLI. The Rust backend (`src-tauri/src/dashboard.rs`), dashboard UI (`src/components/dashboard/`), and sessions page (`src/components/sessions/`) in this project are derived from that work. Many thanks to the original author.
 
+Provider brand icons and the icon picker are adapted from [cc-switch](https://github.com/farion1231/cc-switch) (MIT License, © Jason Young). This project copies its `src/icons/extracted/` icon library and `IconPicker` interaction design. Many thanks to the original author.
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 License: MIT, see [LICENSE](./LICENSE). Copyright (c) 2026 CodingPlan.site