[FEAT] We now have a functional APP

AGENTS.md

@@ -132,8 +132,34 @@ MySQL database connection configured in `api/config/database.php`:
 - Site targets French-speaking users
 - Production URL: `ohmj2.free.fr`
 
+## Design Guidelines
+
+- **Style**: Clean, sober, and modern
+- **Icons**: Use SVG icons instead of emojis for better consistency
+- **Buttons**: Integrate related actions (view + download) in a single row with consistent styling
+- **Hide unnecessary labels**: Don't show "Piece 1" or "Version 1" when there's only one
+- **Visual hierarchy**: Use spacing, subtle borders, and hover effects for interactivity
+
 ## Temporary Work Files
 
 - Use `_builds/` directory for temporary scripts and working files
 - Only `scripts/convert_final_v2.js` should be kept in the scripts folder (committed to git)
 - CSV output files belong in `_builds/`
+
+## Authentication
+
+- **Login**: Use `apiService.login('admin', 'password')` from frontend
+- **API calls**: Include token in Authorization header:
+  ```
+  Authorization: Bearer <token>
+  ```
+- **Token format**: JWT (HS256) - see `api/lib/Auth.php`
+- **Frontend**: Token stored in localStorage, auto-attached to API requests via axios interceptor
+- **Test**: http://localhost:5173 - login with admin/password
+- **API base URL**: http://localhost:8000/api/
+
+## Current Tech Stack (2024)
+
+- **Frontend**: SvelteKit (NOT Vue.js 2) in `/partitions/`
+- **Backend**: PHP API in `/api/`
+- **Scores storage**: `/legacy/Scores/` (directory-based, not MySQL)