iOS: add welcome home canvas

apps/ios/Sources/Screen/ScreenController.swift

@@ -20,6 +20,7 @@ final class ScreenController {
     private var debugStatusEnabled: Bool = false
     private var debugStatusTitle: String?
     private var debugStatusSubtitle: String?
+    private var homeCanvasStateJSON: String?
 
     init() {
         self.reload()
@@ -94,6 +95,26 @@ final class ScreenController {
             subtitle: self.debugStatusSubtitle)
     }
 
+    func updateHomeCanvasState(json: String?) {
+        self.homeCanvasStateJSON = json
+        self.applyHomeCanvasStateIfNeeded()
+    }
+
+    func applyHomeCanvasStateIfNeeded() {
+        guard let webView = self.activeWebView else { return }
+        let payload = self.homeCanvasStateJSON ?? "null"
+        let js = """
+        (() => {
+          try {
+            const api = globalThis.__openclaw;
+            if (!api || typeof api.renderHome !== 'function') return;
+            api.renderHome(\(payload));
+          } catch (_) {}
+        })()
+        """
+        webView.evaluateJavaScript(js) { _, _ in }
+    }
+
     func waitForA2UIReady(timeoutMs: Int) async -> Bool {
         let clock = ContinuousClock()
         let deadline = clock.now.advanced(by: .milliseconds(timeoutMs))
@@ -191,6 +212,7 @@ final class ScreenController {
         self.activeWebView = webView
         self.reload()
         self.applyDebugStatusIfNeeded()
+        self.applyHomeCanvasStateIfNeeded()
     }
 
     func detachWebView(_ webView: WKWebView) {