Refactor frontend structure and update dependencies

- Changed the main entry point from main.jsx to main.tsx for TypeScript support.
- Removed Tabler JS import and integrated Tailwind CSS for styling.
- Updated package.json and package-lock.json to include new dependencies such as @fontsource-variable/geist and tailwindcss, while removing unused ones.
- Enhanced Vite configuration with path aliasing for improved import management.
- Deleted unused App.css and App.jsx files to streamline the project structure.

Made-with: Cursor

frontend/docs/SHADCN_MIGRATION_AUDIT.md

@@ -0,0 +1,42 @@
+# SHADCN Migration Audit
+
+## Scope
+- Frontend path: `frontend/src`
+- Goal: full replacement of Tabler UI with shadcn/ui + Tailwind tokens.
+
+## Findings
+- Direct Tabler dependencies are present in `frontend/package.json`:
+  - `@tabler/core`
+  - `@tabler/icons-react`
+- Tabler runtime imports are used in `frontend/src/main.jsx`:
+  - `@tabler/core/dist/css/tabler.min.css`
+  - `@tabler/core/dist/js/tabler.min.js`
+- Bootstrap/Tabler data API is used in layout and modal flows (`data-bs-*`, `show.bs.*`, `hide.bs.*`).
+- `frontend/src/index.css` contains a large Tabler-coupled style layer (`--tblr-*`, `.navbar-*`, `.btn-*`, `.card-*`, `.table-*` patterns).
+
+## Migration Priority (Feature-first with platform dependencies)
+1. **App shell and navigation**
+   - `App.jsx`
+   - routing shell + sidebar/topbar behavior
+2. **Core UI and design tokens**
+   - `components/ui` generation via shadcn
+   - theme provider + global token CSS
+3. **High traffic features**
+   - `Dashboard`, `ServerManager`, `FilterManager`
+4. **Cross-feature shared components**
+   - modal, table, command/alerts/feedback components
+5. **Remaining pages**
+   - all managers/tools pages not covered in p3
+
+## Hotspots (high coupling)
+- `frontend/src/App.jsx` (layout, routing, theme, i18n in one file)
+- `frontend/src/index.css` (global overrides and hardcoded values)
+- `frontend/src/components/*` (large number of Tabler class usages)
+
+## Enforcement Checklist
+- No `@tabler/*` imports or dependencies.
+- No `data-bs-*` attributes or Bootstrap event listeners.
+- No hardcoded color/radius/spacing values in components.
+- shadcn primitives generated through plugin/CLI only.
+- `components/ui` treated as base layer; composition happens in `components/shared`.
+