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.

components/NutritionRadarCard.tsx

@@ -1,4 +1,5 @@
 import { AnimatedNumber } from '@/components/AnimatedNumber';
+import { FloatingFoodOverlay } from '@/components/FloatingFoodOverlay';
 import { ROUTES } from '@/constants/Routes';
 import { NutritionSummary } from '@/services/dietRecords';
 import { NutritionGoals, calculateRemainingCalories } from '@/utils/nutrition';
@@ -48,6 +49,7 @@ export function NutritionRadarCard({
   onMealPress
 }: NutritionRadarCardProps) {
   const [currentMealType, setCurrentMealType] = useState<'breakfast' | 'lunch' | 'dinner' | 'snack'>('breakfast');
+  const [showFoodOverlay, setShowFoodOverlay] = useState(false);
   const radarValues = useMemo(() => {
     // 基于动态计算的营养目标或默认推荐值
     const recommendations = {
@@ -108,7 +110,7 @@ export function NutritionRadarCard({
   };
 
   const handleAddFood = () => {
-    router.push(`/food-library?mealType=${currentMealType}`);
+    setShowFoodOverlay(true);
   };
 
   return (
@@ -192,6 +194,12 @@ export function NutritionRadarCard({
         </View>
       </View>
 
+      {/* 食物添加悬浮窗 */}
+      <FloatingFoodOverlay
+        visible={showFoodOverlay}
+        onClose={() => setShowFoodOverlay(false)}
+        mealType={currentMealType}
+      />
 
     </TouchableOpacity>
   );