feat(02-05): wire iOS OIDC callback

- Register recipe URL scheme in Info.plist
- Forward SwiftUI openURL callbacks to the AppAuth bridge

iosApp/iosApp/Info.plist

@@ -4,5 +4,16 @@
     <dict>
         <key>CADisableMinimumFrameDurationOnPhone</key>
         <true/>
+        <key>CFBundleURLTypes</key>
+        <array>
+            <dict>
+                <key>CFBundleURLName</key>
+                <string>dev.ulfrx.recipe.auth</string>
+                <key>CFBundleURLSchemes</key>
+                <array>
+                    <string>recipe</string>
+                </array>
+            </dict>
+        </array>
     </dict>
 </plist>

iosApp/iosApp/iOSApp.swift

@@ -10,6 +10,12 @@ struct iOSApp: App {
     var body: some Scene {
         WindowGroup {
             ContentView()
+                .onOpenURL { url in
+                    guard url.scheme == "recipe", url.host == "callback" else {
+                        return
+                    }
+                    _ = IosAppAuthBridge.shared.resumeExternalUserAgentFlow(urlString: url.absoluteString)
+                }
         }
     }
 }