fix(android): restore chat text streaming

apps/android/app/src/main/java/ai/openclaw/android/chat/ChatController.kt

@@ -325,6 +325,12 @@ class ChatController(
 
     val state = payload["state"].asStringOrNull()
     when (state) {
+      "delta" -> {
+        val text = parseAssistantDeltaText(payload)
+        if (!text.isNullOrEmpty()) {
+          _streamingAssistantText.value = text
+        }
+      }
       "final", "aborted", "error" -> {
         if (state == "error") {
           _errorText.value = payload["errorMessage"].asStringOrNull() ?: "Chat failed"
@@ -351,9 +357,8 @@ class ChatController(
 
   private fun handleAgentEvent(payloadJson: String) {
     val payload = json.parseToJsonElement(payloadJson).asObjectOrNull() ?: return
-    val runId = payload["runId"].asStringOrNull()
-    val sessionId = _sessionId.value
-    if (sessionId != null && runId != sessionId) return
+    val sessionKey = payload["sessionKey"].asStringOrNull()?.trim()
+    if (!sessionKey.isNullOrEmpty() && sessionKey != _sessionKey.value) return
 
     val stream = payload["stream"].asStringOrNull()
     val data = payload["data"].asObjectOrNull()
@@ -398,6 +403,21 @@ class ChatController(
     }
   }
 
+  private fun parseAssistantDeltaText(payload: JsonObject): String? {
+    val message = payload["message"].asObjectOrNull() ?: return null
+    if (message["role"].asStringOrNull() != "assistant") return null
+    val content = message["content"].asArrayOrNull() ?: return null
+    for (item in content) {
+      val obj = item.asObjectOrNull() ?: continue
+      if (obj["type"].asStringOrNull() != "text") continue
+      val text = obj["text"].asStringOrNull()
+      if (!text.isNullOrEmpty()) {
+        return text
+      }
+    }
+    return null
+  }
+
   private fun publishPendingToolCalls() {
     _pendingToolCalls.value =
       pendingToolCallsById.values.sortedBy { it.startedAtMs }