feat: Auto-save components, soft delete, tags, compact WCO header

- Auto-save rendered Vue components to DB on render_vue_component
- Soft delete (archive) instead of hard delete for components
- Tags support for component categorization
- Gallery limited to 10 most recent items per section
- Upsert with ON CONFLICT for component saves
- PUT endpoint for partial component updates
- Collapsible toolbar with animated toggle button
- Window Controls Overlay support for PWA titlebar
- Compact header mode (32px) with hidden dot toggle
- Dynamic theme-color meta sync for Windows titlebar

frontend/vite.config.ts

@@ -34,9 +34,10 @@ export default defineConfig({
         name: 'Agent UI',
         short_name: 'AgentUI',
         description: 'Dynamic canvas for Claude Code interaction via WebMCP',
-        theme_color: '#16161d',
+        theme_color: '#0f0f14',
         background_color: '#0f0f14',
         display: 'standalone',
+        display_override: ['window-controls-overlay'],
         orientation: 'any',
         start_url: '/',
         scope: '/',