Migrate from Core Data to SwiftData

- Replace Core Data with SwiftData for iOS 18+
- Create MoodEntryModel as @Model class replacing MoodEntry entity
- Create SharedModelContainer for App Group container sharing
- Create DataController with CRUD extensions replacing PersistenceController
- Update all views and view models to use MoodEntryModel
- Update widget extension to use SwiftData
- Remove old Core Data files (Persistence*.swift, .xcdatamodeld)
- Add EntryType enum with all entry type cases
- Fix widget label truncation with proper spacing and text scaling

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Feels.xcodeproj/project.pbxproj

@@ -92,10 +92,9 @@
 				"Color+Codable.swift",
 				"Date+Extensions.swift",
 				EventLogger.swift,
-				Feels.xcdatamodeld,
 				Models/DiamondView.swift,
 				Models/Mood.swift,
-				Models/MoodEntryExtension.swift,
+				Models/MoodEntryModel.swift,
 				Models/MoodImagable.swift,
 				Models/MoodMetrics.swift,
 				Models/MoodTintable.swift,
@@ -105,11 +104,12 @@
 				Models/UserDefaultsStore.swift,
 				Onboarding/OnboardingData.swift,
 				Onboarding/views/OnboardingDay.swift,
-				Persisence/Persistence.swift,
-				Persisence/PersistenceADD.swift,
-				Persisence/PersistenceDELETE.swift,
-				Persisence/PersistenceGET.swift,
-				Persisence/PersistenceHelper.swift,
+				Persisence/DataController.swift,
+				Persisence/DataControllerADD.swift,
+				Persisence/DataControllerDELETE.swift,
+				Persisence/DataControllerGET.swift,
+				Persisence/DataControllerHelper.swift,
+				Persisence/SharedModelContainer.swift,
 				Random.swift,
 				ShowBasedOnVoteLogics.swift,
 				Views/BGView.swift,