feat: Implement Food Camera Screen and Floating Food Overlay

- Added FoodCameraScreen for capturing food images with camera functionality.
- Integrated image picker for selecting images from the gallery.
- Created FloatingFoodOverlay for quick access to food library and scanning options.
- Updated NutritionRadarCard to utilize FloatingFoodOverlay for adding food.
- Enhanced ExploreScreen layout and styles for better user experience.
- Removed unused SafeAreaView from ExploreScreen.
- Updated profile edit screen to remove unnecessary state variables.
- Updated avatar image source in profile edit screen.
- Added ExpoCamera dependency for camera functionalities.

package.json

@@ -30,6 +30,7 @@
     "expo-background-fetch": "^13.1.6",
     "expo-background-task": "~0.2.8",
     "expo-blur": "~14.1.5",
+    "expo-camera": "^16.1.11",
     "expo-constants": "~17.1.7",
     "expo-font": "~13.3.2",
     "expo-haptics": "~14.1.4",