feat: add mobile application structure with emotion picker and API integration

- Added favicon and icon assets for the mobile app.
- Implemented EmotionPicker component for selecting emotions with child options.
- Created hooks for fetching emotions, feeds, and rapport data.
- Established API service for handling requests and authentication.
- Integrated Zustand for state management of user authentication.
- Defined color palette for the application.
- Set up TypeScript types for various entities including User, Emotion, and Feed.
- Configured Babel and TypeScript for the mobile project.
- Added package.json with necessary dependencies for Expo and React Native.

backend/app/Http/Requests/StoreFeedRequest.php

@@ -17,7 +17,7 @@ class StoreFeedRequest extends FormRequest
         $rules = [
             'titre' => 'required|string|max:255',
             'contenu' => 'required|string',
-            'image_url' => 'nullable|string|max:500',
+            'image_url' => 'nullable|url|max:500',
             'est_publie' => 'boolean',
             'ordre' => 'integer|min:0',
         ];