Add CBT-based guided reflection questions with clinical info sheet

Replace generic journaling prompts with evidence-based therapeutic
techniques: CBT thought record for negative moods, ACT cognitive
defusion for neutral, and behavioral activation for positive. Each
question now shows a clinical step label (e.g. SITUATION, REFRAME).
Added info button linking to a new sheet explaining the techniques
with citations to Beck, Harris, and Martell/Dimidjian.

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

Shared/Models/GuidedReflection.swift

@@ -10,9 +10,9 @@ import Foundation
 // MARK: - Mood Category
 
 enum MoodCategory: String, Codable {
-    case positive  // great, good → 3 questions
-    case neutral   // average → 4 questions
-    case negative  // bad, horrible → 4 questions
+    case positive  // great, good → 3 questions (Behavioral Activation)
+    case neutral   // average → 4 questions (ACT Cognitive Defusion)
+    case negative  // bad, horrible → 4 questions (CBT Thought Record)
 
     init(from mood: Mood) {
         switch mood {
@@ -29,6 +29,41 @@ enum MoodCategory: String, Codable {
         case .neutral, .negative: return 4
         }
     }
+
+    /// The therapeutic technique name for display purposes.
+    var techniqueName: String {
+        switch self {
+        case .positive: return "Behavioral Activation"
+        case .neutral: return "Acceptance & Commitment Therapy"
+        case .negative: return "Cognitive Behavioral Therapy"
+        }
+    }
+
+    /// Short CBT step labels shown above each question.
+    var stepLabels: [String] {
+        switch self {
+        case .negative:
+            return [
+                String(localized: "Situation"),
+                String(localized: "Automatic Thought"),
+                String(localized: "Perspective Check"),
+                String(localized: "Reframe"),
+            ]
+        case .neutral:
+            return [
+                String(localized: "Awareness"),
+                String(localized: "Thought"),
+                String(localized: "Defusion"),
+                String(localized: "Values"),
+            ]
+        case .positive:
+            return [
+                String(localized: "Activity"),
+                String(localized: "Awareness"),
+                String(localized: "Planning"),
+            ]
+        }
+    }
 }
 
 // MARK: - Guided Reflection