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/HeaderStatsView.swift

@@ -24,16 +24,16 @@ struct HeaderStatsView : UIViewRepresentable {
         }
         self.tmpHolderToMakeViewDiffefrent = Color.random()
         entries = [BarChartDataEntry]()
-        
-        var moodEntries: [MoodEntry]?
+
+        var moodEntries: [MoodEntryModel]?
 
         if fakeData {
-            moodEntries = PersistenceController.shared.randomEntries(count: 10)
+            moodEntries = DataController.shared.randomEntries(count: 10)
         } else {
             var daysAgo = Calendar.current.date(byAdding: .day, value: -backDays, to: Date())!
             daysAgo = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: daysAgo)!
-            
-            moodEntries = PersistenceController.shared.getData(startDate: daysAgo, endDate: Date(), includedDays: [1,2,3,4,5,6,7])
+
+            moodEntries = DataController.shared.getData(startDate: daysAgo, endDate: Date(), includedDays: [1,2,3,4,5,6,7])
         }
         if let moodEntries = moodEntries {
             for (index, mood) in Mood.allValues.enumerated() {