iOS: Fix canvas touch events and auto-hide status bubble

- Disable scroll on WKWebView to allow touch events to reach canvas
- Add WKNavigationDelegate to intercept clawdis:// deep links from canvas
- Wire up onDeepLink callback to handle taps on canvas buttons
- Auto-hide status bubble after 3 seconds

apps/ios/Sources/Model/NodeAppModel.swift

@@ -35,6 +35,14 @@ final class NodeAppModel {
 
         let enabled = UserDefaults.standard.bool(forKey: "voiceWake.enabled")
         self.voiceWake.setEnabled(enabled)
+        
+        // Wire up deep links from canvas taps
+        self.screen.onDeepLink = { [weak self] url in
+            guard let self else { return }
+            Task { @MainActor in
+                await self.handleDeepLink(url: url)
+            }
+        }
     }
 
     func setScenePhase(_ phase: ScenePhase) {