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/Views/InsightsView/ReportsViewModel.swift

@@ -322,7 +322,12 @@ class ReportsViewModel: ObservableObject {
             let day = entry.date.formatted(.dateTime.weekday(.abbreviated))
             let mood = entry.mood.widgetDisplayName
             let notes = entry.notes ?? "no notes"
-            return "\(day): \(mood) (\(notes))"
+            let reflectionSummary = entry.reflection?.responses
+                .filter { !$0.answer.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }
+                .map { "\($0.question): \(String($0.answer.prefix(150)))" }
+                .joined(separator: " | ") ?? ""
+            let reflectionStr = reflectionSummary.isEmpty ? "" : " [reflection: \(reflectionSummary)]"
+            return "\(day): \(mood) (\(notes))\(reflectionStr)"
         }.joined(separator: "\n")
 
         let prompt = """