Add premium features and reorganize Settings tab

Premium Features:
- Journal notes and photo attachments for mood entries
- Data export (CSV and PDF reports)
- Privacy lock with Face ID/Touch ID
- Apple Health integration for mood correlation
- 4 new personality packs (Motivational Coach, Zen Master, Best Friend, Data Analyst)

Settings Tab Reorganization:
- Combined Customize and Settings into single tab with segmented control
- Added upgrade banner with trial countdown above segment
- "Why Upgrade?" sheet showing all premium benefits
- Subscribe button opens improved StoreKit 2 subscription view

UI Improvements:
- Enhanced subscription store with feature highlights
- Entry detail view for viewing/editing notes and photos
- Removed duplicate subscription banners from tab content

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/Services/MoodDataSummarizer.swift

@@ -46,6 +46,16 @@ struct MoodDataSummary {
     // Notable observations
     let hasAllMoodTypes: Bool
     let missingMoodTypes: [String]
+
+    // Health correlations (optional)
+    let healthCorrelations: [HealthCorrelation]
+}
+
+/// Health correlation data for AI insights
+struct HealthCorrelation {
+    let metric: String
+    let insight: String
+    let correlation: String  // "positive", "negative", or "none"
 }
 
 /// Transforms raw MoodEntryModel data into AI-optimized summaries
@@ -59,7 +69,7 @@ class MoodDataSummarizer {
 
     // MARK: - Main Summarization
 
-    func summarize(entries: [MoodEntryModel], periodName: String) -> MoodDataSummary {
+    func summarize(entries: [MoodEntryModel], periodName: String, healthCorrelations: [HealthCorrelation] = []) -> MoodDataSummary {
         let validEntries = entries.filter { ![.missing, .placeholder].contains($0.mood) }
 
         guard !validEntries.isEmpty else {
@@ -103,7 +113,8 @@ class MoodDataSummarizer {
             last7DaysAverage: recentContext.average,
             last7DaysMoods: recentContext.moods,
             hasAllMoodTypes: moodTypes.hasAll,
-            missingMoodTypes: moodTypes.missing
+            missingMoodTypes: moodTypes.missing,
+            healthCorrelations: healthCorrelations
         )
     }
 
@@ -379,7 +390,8 @@ class MoodDataSummarizer {
             last7DaysAverage: 0,
             last7DaysMoods: [],
             hasAllMoodTypes: false,
-            missingMoodTypes: ["great", "good", "average", "bad", "horrible"]
+            missingMoodTypes: ["great", "good", "average", "bad", "horrible"],
+            healthCorrelations: []
         )
     }
 
@@ -411,6 +423,14 @@ class MoodDataSummarizer {
         // Stability
         lines.append("Stability: \(String(format: "%.0f", summary.moodStabilityScore * 100))%, Mood swings: \(summary.moodSwingCount)")
 
+        // Health correlations (if available)
+        if !summary.healthCorrelations.isEmpty {
+            lines.append("Health correlations:")
+            for correlation in summary.healthCorrelations {
+                lines.append("- \(correlation.metric): \(correlation.insight)")
+            }
+        }
+
         return lines.joined(separator: "\n")
     }
 }