fix: restore canvas action bridge

apps/android/app/src/main/java/com/steipete/clawdis/node/NodeRuntime.kt

@@ -396,8 +396,7 @@ class NodeRuntime(context: Context) {
       val actionId = (userActionObj["id"] as? JsonPrimitive)?.content?.trim().orEmpty().ifEmpty {
         java.util.UUID.randomUUID().toString()
       }
-      val name = (userActionObj["name"] as? JsonPrimitive)?.content?.trim().orEmpty()
-      if (name.isEmpty()) return@launch
+      val name = ClawdisCanvasA2UIAction.extractActionName(userActionObj) ?: return@launch
 
       val surfaceId =
         (userActionObj["surfaceId"] as? JsonPrimitive)?.content?.trim().orEmpty().ifEmpty { "main" }

apps/android/app/src/main/java/com/steipete/clawdis/node/protocol/ClawdisCanvasA2UIAction.kt

@@ -1,6 +1,24 @@
 package com.steipete.clawdis.node.protocol
 
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.json.JsonPrimitive
+
 object ClawdisCanvasA2UIAction {
+  fun extractActionName(userAction: JsonObject): String? {
+    val name =
+      (userAction["name"] as? JsonPrimitive)
+        ?.content
+        ?.trim()
+        .orEmpty()
+    if (name.isNotEmpty()) return name
+    val action =
+      (userAction["action"] as? JsonPrimitive)
+        ?.content
+        ?.trim()
+        .orEmpty()
+    return action.ifEmpty { null }
+  }
+
   fun sanitizeTagValue(value: String): String {
     val trimmed = value.trim().ifEmpty { "-" }
     val normalized = trimmed.replace(" ", "_")
@@ -46,4 +64,3 @@ object ClawdisCanvasA2UIAction {
     return "window.dispatchEvent(new CustomEvent('clawdis:a2ui-action-status', { detail: { id: \"${idEscaped}\", ok: ${okLiteral}, error: \"${err}\" } }));"
   }
 }
-

apps/android/app/src/main/java/com/steipete/clawdis/node/ui/RootScreen.kt

@@ -191,11 +191,14 @@ private fun CanvasView(viewModel: MainViewModel, modifier: Modifier = Modifier)
         setBackgroundColor(Color.BLACK)
         setLayerType(View.LAYER_TYPE_HARDWARE, null)
 
-        addJavascriptInterface(
+        val a2uiBridge =
           CanvasA2UIActionBridge { payload ->
             viewModel.handleCanvasA2UIActionFromWebView(payload)
-          },
-          CanvasA2UIActionBridge.interfaceName,
+          }
+        addJavascriptInterface(a2uiBridge, CanvasA2UIActionBridge.interfaceName)
+        addJavascriptInterface(
+          CanvasA2UIActionLegacyBridge(a2uiBridge),
+          CanvasA2UIActionLegacyBridge.interfaceName,
         )
         viewModel.canvas.attach(this)
       }
@@ -215,3 +218,19 @@ private class CanvasA2UIActionBridge(private val onMessage: (String) -> Unit) {
     const val interfaceName: String = "clawdisCanvasA2UIAction"
   }
 }
+
+private class CanvasA2UIActionLegacyBridge(private val bridge: CanvasA2UIActionBridge) {
+  @JavascriptInterface
+  fun canvasAction(payload: String?) {
+    bridge.postMessage(payload)
+  }
+
+  @JavascriptInterface
+  fun postMessage(payload: String?) {
+    bridge.postMessage(payload)
+  }
+
+  companion object {
+    const val interfaceName: String = "Android"
+  }
+}