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>

Shared/Views/SharingTemplates/MonthTotalTemplate.swift

@@ -28,8 +28,8 @@ struct MonthTotalTemplate: View, SharingTemplate {
     @AppStorage(UserDefaultsStore.Keys.textColor.rawValue, store: GroupUserDefaults.groupDefaults) private var textColor: Color = .white
 
     private var moodMetrics = [MoodMetrics]()
-    private var moodEntries = [MoodEntry]()
-    
+    private var moodEntries = [MoodEntryModel]()
+
     let columns = [
         GridItem(.flexible(minimum: 5, maximum: .infinity), alignment: .center),
         GridItem(.flexible(minimum: 5, maximum: .infinity), alignment: .center),
@@ -39,30 +39,25 @@ struct MonthTotalTemplate: View, SharingTemplate {
         GridItem(.flexible(minimum: 5, maximum: .infinity), alignment: .center),
         GridItem(.flexible(minimum: 5, maximum: .infinity), alignment: .center)
     ]
-    
+
+    @MainActor
     init(isPreview: Bool, startDate: Date, endDate: Date, fakeData: Bool) {
         self.isPreview = isPreview
         self.startDate = startDate
         self.endDate = endDate
-        
-        var _moodEntries: [MoodEntry]?
-        
+
+        var _moodEntries: [MoodEntryModel]?
+
         if fakeData {
-            _moodEntries = PersistenceController.shared.randomEntries(count: 10)
+            _moodEntries = DataController.shared.randomEntries(count: 10)
         } else {
-            
-            _moodEntries = PersistenceController.shared.getData(startDate: startDate,
-                                                                endDate: endDate,
-                                                                includedDays: [1,2,3,4,5,6,7])
-            
-            //            _moodEntries = PersistenceController.shared.getData(startDate:Calendar.current.date(byAdding: .day, value: -33, to: Date())!,
-            //                                                                endDate: Date(),
-            //                                                                includedDays: [1,2,3,4,5,6,7])
-            
+            _moodEntries = DataController.shared.getData(startDate: startDate,
+                                                         endDate: endDate,
+                                                         includedDays: [1,2,3,4,5,6,7])
         }
-        
-        moodEntries = _moodEntries ?? [MoodEntry]()
-        
+
+        moodEntries = _moodEntries ?? [MoodEntryModel]()
+
         totalEntryCount = moodEntries.count
         moodMetrics = Random.createTotalPerc(fromEntries: moodEntries)
         moodMetrics = moodMetrics.sorted(by: {