Develop (#55)

feat: optimize dashboard/search UX and simplify extension architecture

Redesign Dashboard with compact tool grid and recently used tools
Improve TopBar search UX with Cmd/Ctrl+K shortcut and better history navigation
Reorganize project structure into src/
Migrate i18n from react-i18next to chrome.i18n
Remove runtime language switch and settings page
Remove HTML/Markdown conversion tools
Clean up unused code, dead animations, redundant comments, and imports
Improve component consistency with shadcn/ui patterns
Replace hardcoded strings/colors with i18n tokens and theme tokens
Add comprehensive project documentation and coding standards
Fix CI artifact upload workflow and multiple TypeScript/test issues

Includes various refactors, UI polish, i18n cleanup, CI improvements,
and maintenance updates across the codebase.

package.json

@@ -36,15 +36,11 @@
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "dayjs": "^1.11.20",
-    "i18next": "^26.2.0",
-    "i18next-browser-languagedetector": "^8.2.1",
     "lucide-react": "^1.16.0",
-    "marked": "^18.0.4",
     "qr-scanner": "^1.4.2",
     "qrious": "^4.0.2",
     "react": "^19.2.6",
     "react-dom": "^19.2.6",
-    "react-i18next": "^17.0.8",
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.6.0"
   },