Refactor components and enhance background task management

- Updated font sizes and weights in BasalMetabolismCard, MoodCard, HealthDataCard, and NutritionRadarCard for improved readability.
- Removed loading state from MoodCard to simplify the component.
- Adjusted styles in WeightHistoryCard for better layout and spacing.
- Integrated expo-background-fetch for improved background task handling.
- Updated Info.plist to include background fetch capability.
- Enhanced background task registration and execution logic in backgroundTaskManager.
- Added debug function to manually trigger background task execution for testing purposes.

package.json

@@ -27,6 +27,7 @@
     "dayjs": "^1.11.13",
     "expo": "~53.0.20",
     "expo-apple-authentication": "6.4.2",
+    "expo-background-fetch": "^13.1.6",
     "expo-background-task": "~0.2.8",
     "expo-blur": "~14.1.5",
     "expo-constants": "~17.1.7",