Add guided reflection flow with mood-adaptive CBT/ACT questions

Walks users through 3-4 guided questions based on mood category:
positive (great/good) gets gratitude-oriented questions, neutral
(average) gets exploratory questions, and negative (bad/horrible)
gets empathetic questions. Stored as JSON in MoodEntryModel,
integrated into PDF reports, AI summaries, and CSV export.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Shared/Analytics.swift

@@ -350,6 +350,7 @@ extension AnalyticsManager {
         case paywall = "paywall"
         case entryDetail = "entry_detail"
         case noteEditor = "note_editor"
+        case guidedReflection = "guided_reflection"
         case lockScreen = "lock_screen"
         case sharing = "sharing"
         case themePicker = "theme_picker"
@@ -382,6 +383,8 @@ extension AnalyticsManager {
         case noteUpdated(characterCount: Int)
         case photoAdded
         case photoDeleted
+        case reflectionStarted
+        case reflectionCompleted(answeredCount: Int)
         case missingEntriesFilled(count: Int)
         case entryDeleted(mood: Int)
         case allDataCleared
@@ -491,6 +494,10 @@ extension AnalyticsManager {
                 return ("photo_added", nil)
             case .photoDeleted:
                 return ("photo_deleted", nil)
+            case .reflectionStarted:
+                return ("reflection_started", nil)
+            case .reflectionCompleted(let count):
+                return ("reflection_completed", ["answered_count": count])
             case .missingEntriesFilled(let count):
                 return ("missing_entries_filled", ["count": count])
             case .entryDeleted(let mood):