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/StoreSaisieRequest.php

@@ -17,7 +17,7 @@ class StoreSaisieRequest extends FormRequest
             'emotion_id' => 'required|exists:emotions,id',
             'intensite' => 'required|integer|between:1,10',
             'note' => 'nullable|string|max:2000',
-            'date_saisie' => 'required|date',
+            'date_saisie' => 'required|date_format:Y-m-d',
         ];
     }