Remove #if DEBUG guards for TestFlight, polish weekly digest and insights UX

- Remove #if DEBUG from all debug settings, exporters, and IAP bypass so
  debug options are available in TestFlight builds
- Weekly digest card: replace dismiss X with collapsible chevron caret
- Weekly digest: generate on-demand when opening Insights tab if no cached
  digest exists (BGTask + notification kept as bonus path)
- Fix digest intention text color (was .secondary, now uses theme textColor)
- Add "Generate Weekly Digest" debug button in Settings
- Add generating overlay on Insights tab with pulsing sparkles icon that
  stays visible until all sections finish loading (content at 0.2 opacity)

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

Shared/IAPManager.swift

@@ -37,13 +37,9 @@ class IAPManager: ObservableObject {
 
     /// Set to `true` to bypass all subscription checks and grant full access (for development only)
     /// Togglable at runtime in DEBUG builds via Settings > Debug > Bypass Subscription
-    #if DEBUG
     @Published var bypassSubscription: Bool {
         didSet { UserDefaults.standard.set(bypassSubscription, forKey: "debug_bypassSubscription") }
     }
-    #else
-    let bypassSubscription = false
-    #endif
 
     // MARK: - Constants
 
@@ -140,9 +136,7 @@ class IAPManager: ObservableObject {
     // MARK: - Initialization
 
     init() {
-        #if DEBUG
         self.bypassSubscription = UserDefaults.standard.bool(forKey: "debug_bypassSubscription")
-        #endif
         restoreCachedSubscriptionState()
         updateListenerTask = listenForTransactions()
 
@@ -365,7 +359,6 @@ class IAPManager: ObservableObject {
         return false
     }
 
-    #if DEBUG
     /// Reset subscription state for UI testing. Called after group defaults are cleared
     /// so that stale cached state from previous test runs is discarded.
     func resetForTesting() {
@@ -382,7 +375,6 @@ class IAPManager: ObservableObject {
 
         updateTrialState()
     }
-    #endif
 
     private func updateTrialState() {
         let daysSinceInstall = Calendar.current.dateComponents([.day], from: firstLaunchDate, to: Date()).day ?? 0