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/Persisence/DataControllerDELETE.swift

@@ -0,0 +1,40 @@
+//
+//  DataControllerDELETE.swift
+//  Feels
+//
+//  SwiftData DELETE operations.
+//
+
+import SwiftData
+import Foundation
+
+extension DataController {
+    func clearDB() {
+        do {
+            try modelContext.delete(model: MoodEntryModel.self)
+            saveAndRunDataListeners()
+        } catch {
+            fatalError("Failed to clear database: \(error)")
+        }
+    }
+
+    func deleteLast(numberOfEntries: Int) {
+        let startDate = Calendar.current.date(byAdding: .day, value: -numberOfEntries, to: Date())!
+        let entries = getData(startDate: startDate, endDate: Date(), includedDays: [])
+
+        for entry in entries {
+            modelContext.delete(entry)
+        }
+        save()
+    }
+
+    func deleteRandomFromLast(numberOfEntries: Int) {
+        let startDate = Calendar.current.date(byAdding: .day, value: -numberOfEntries, to: Date())!
+        let entries = getData(startDate: startDate, endDate: Date(), includedDays: [])
+
+        for entry in entries where Bool.random() {
+            modelContext.delete(entry)
+        }
+        save()
+    }
+}