Add AI-powered mental wellness features: Reflection Companion, Pattern Tags, Weekly Digest

Three new Foundation Models features to deepen user engagement with mental wellness:

1. AI Reflection Companion — personalized feedback after completing guided reflections,
   referencing the user's actual words with personality-pack-adapted tone
2. Mood Pattern Tags — auto-extracts theme tags (work, family, stress, etc.) from notes
   and reflections, displayed as colored pills on entries
3. Weekly Emotional Digest — BGTask-scheduled Sunday digest with headline, summary,
   highlight, and intention; shown as card in Insights tab with notification

All features: on-device (zero cost), premium-gated, iOS 26+ with graceful degradation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Shared/Views/NoteEditorView.swift

@@ -129,6 +129,12 @@ struct NoteEditorView: View {
         let success = DataController.shared.updateNotes(forDate: entry.forDate, notes: noteToSave)
 
         if success {
+            // Fire-and-forget tag extraction after saving a note
+            if #available(iOS 26, *), !IAPManager.shared.shouldShowPaywall, noteToSave != nil {
+                Task {
+                    await FoundationModelsTagService.shared.extractAndSaveTags(for: entry)
+                }
+            }
             dismiss()
         } else {
             isSaving = false
@@ -186,6 +192,11 @@ struct EntryDetailView: View {
                     // Mood section
                     moodSection
 
+                    // Tags section
+                    if entry.hasTags {
+                        tagsSection
+                    }
+
                     // Guided reflection section
                     if currentMood != .missing && currentMood != .placeholder {
                         reflectionSection
@@ -389,6 +400,35 @@ struct EntryDetailView: View {
         }
     }
 
+    private var tagsSection: some View {
+        VStack(alignment: .leading, spacing: 12) {
+            Text(String(localized: "Themes"))
+                .font(.headline)
+                .foregroundColor(textColor)
+
+            FlowLayout(spacing: 8) {
+                ForEach(entry.tags, id: \.self) { tag in
+                    Text(tag.capitalized)
+                        .font(.caption)
+                        .fontWeight(.medium)
+                        .padding(.horizontal, 12)
+                        .padding(.vertical, 6)
+                        .background(
+                            Capsule()
+                                .fill(moodColor.opacity(0.15))
+                        )
+                        .foregroundColor(moodColor)
+                }
+            }
+            .padding()
+            .frame(maxWidth: .infinity, alignment: .leading)
+            .background(
+                RoundedRectangle(cornerRadius: 16)
+                    .fill(Color(.systemBackground))
+            )
+        }
+    }
+
     private var notesSection: some View {
         VStack(alignment: .leading, spacing: 12) {
             HStack {