Fix feels://subscribe deep link on cold launch via app.open()

When XCUITest calls app.open(url), the app relaunches (cold launch) and
onOpenURL doesn't fire reliably. Capture the URL from launch options in
AppDelegate and check it on appear with a short delay to ensure the view
hierarchy is ready for sheet presentation.

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

Shared/FeelsApp.swift

@@ -63,9 +63,7 @@ struct FeelsApp: App {
                         .environmentObject(iapManager)
                 }
                 .onOpenURL { url in
-                    if url.scheme == "feels" && url.host == "subscribe" {
-                        showSubscriptionFromWidget = true
-                    }
+                    handleDeepLink(url)
                 }
                 .alert("Data Storage Unavailable",
                        isPresented: $showStorageFallbackAlert) {
@@ -77,6 +75,12 @@ struct FeelsApp: App {
                     if SharedModelContainer.isUsingInMemoryFallback {
                         AnalyticsManager.shared.track(.storageFallbackActivated)
                     }
+                    if let url = AppDelegate.pendingDeepLinkURL {
+                        AppDelegate.pendingDeepLinkURL = nil
+                        DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
+                            handleDeepLink(url)
+                        }
+                    }
                 }
 
                 // Lock screen overlay
@@ -141,5 +145,10 @@ struct FeelsApp: App {
             }
         }
     }
-    
+
+    private func handleDeepLink(_ url: URL) {
+        if url.scheme == "feels" && url.host == "subscribe" {
+            showSubscriptionFromWidget = true
+        }
+    }
 }