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/Models/MoodEntryExtension.swift

@@ -1,26 +0,0 @@
-//
-//  MoodEntryExtension.swift
-//  Feels
-//
-//  Created by Trey Tartt on 1/5/22.
-//
-
-import Foundation
-
-enum EntryType: Int {
-    case notification
-    case header
-    case listView
-    case filledInMissing
-    case widget
-}
-
-extension MoodEntry {
-    var moodString: String {
-        return Mood.init(rawValue: Int(self.moodValue))?.strValue ?? "NA"
-    }
-    
-    var mood: Mood {
-        return Mood.init(rawValue: Int(self.moodValue))!
-    }
-}

Shared/Models/MoodEntryModel.swift

@@ -0,0 +1,81 @@
+//
+//  MoodEntryModel.swift
+//  Feels
+//
+//  SwiftData model replacing Core Data MoodEntry
+//
+
+import Foundation
+import SwiftData
+
+// MARK: - Entry Type Enum
+
+enum EntryType: Int, Codable {
+    case listView = 0
+    case widget = 1
+    case watch = 2
+    case shortcut = 3
+    case filledInMissing = 4
+    case notification = 5
+    case header = 6
+}
+
+// MARK: - SwiftData Model
+
+@Model
+final class MoodEntryModel {
+    // Primary attributes
+    var forDate: Date
+    var moodValue: Int
+    var timestamp: Date
+    var weekDay: Int
+    var entryType: Int
+
+    // Metadata
+    var canEdit: Bool
+    var canDelete: Bool
+
+    // Computed properties
+    var mood: Mood {
+        Mood(rawValue: moodValue) ?? .missing
+    }
+
+    var moodString: String {
+        mood.strValue
+    }
+
+    init(
+        forDate: Date,
+        mood: Mood,
+        entryType: EntryType,
+        canEdit: Bool = true,
+        canDelete: Bool = true
+    ) {
+        self.forDate = forDate
+        self.moodValue = mood.rawValue
+        self.timestamp = Date()
+        self.weekDay = Calendar.current.component(.weekday, from: forDate)
+        self.entryType = entryType.rawValue
+        self.canEdit = canEdit
+        self.canDelete = canDelete
+    }
+
+    // Convenience initializer for raw values
+    init(
+        forDate: Date,
+        moodValue: Int,
+        entryType: Int,
+        timestamp: Date = Date(),
+        weekDay: Int? = nil,
+        canEdit: Bool = true,
+        canDelete: Bool = true
+    ) {
+        self.forDate = forDate
+        self.moodValue = moodValue
+        self.timestamp = timestamp
+        self.weekDay = weekDay ?? Calendar.current.component(.weekday, from: forDate)
+        self.entryType = entryType
+        self.canEdit = canEdit
+        self.canDelete = canDelete
+    }
+}