Improve subscription UI and fix trial date handling

Lock Screen:
- Add light/dark mode support with adaptive colors
- Make passcode text tappable to trigger authentication

Trial Date Fixes:
- Fix IAPManager to read firstLaunchDate directly from UserDefaults
- Add expiration date check (> Date()) before showing "expires in" text
- Show "Trial expired" when trial end date is in the past
- Disable subscription bypass in DEBUG mode for testing

Month/Year Subscribe Prompts:
- Redesign with gradient icons and compelling copy
- Add fade mask (100% at top to 0% at 50%) for content behind
- Position subscribe overlay on bottom half of screen
- Month: purple/pink theme with calendar icon
- Year: orange/pink theme with chart icon

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

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

Shared/IAPManager.swift

@@ -33,8 +33,9 @@ class IAPManager: ObservableObject {
     // MARK: - Debug Toggle
 
     /// Set to `true` to bypass all subscription checks and grant full access (for development only)
+    /// Set to `false` to test trial/subscription behavior in DEBUG builds
     #if DEBUG
-    static let bypassSubscription = true
+    static let bypassSubscription = false
     #else
     static let bypassSubscription = false
     #endif
@@ -59,8 +60,16 @@ class IAPManager: ObservableObject {
 
     // MARK: - Storage
 
-    @AppStorage(UserDefaultsStore.Keys.firstLaunchDate.rawValue, store: GroupUserDefaults.groupDefaults)
-    private var firstLaunchDate = Date()
+    /// Reads firstLaunchDate directly from UserDefaults to ensure we always get the latest value
+    /// (Using @AppStorage in a class doesn't auto-sync when other components update the same key)
+    private var firstLaunchDate: Date {
+        get {
+            GroupUserDefaults.groupDefaults.object(forKey: UserDefaultsStore.Keys.firstLaunchDate.rawValue) as? Date ?? Date()
+        }
+        set {
+            GroupUserDefaults.groupDefaults.set(newValue, forKey: UserDefaultsStore.Keys.firstLaunchDate.rawValue)
+        }
+    }
 
     // MARK: - Private