chore: update appcast and TUI streaming handling

src/tui/components/chat-log.ts

@@ -8,6 +8,7 @@ export class ChatLog extends Container {
   private toolById = new Map<string, ToolExecutionComponent>();
   private streamingAssistant: AssistantMessageComponent | null = null;
   private streamingRunId: string | null = null;
+  private streamingText: string | null = null;
   private toolsExpanded = false;
 
   clearAll() {
@@ -15,6 +16,7 @@ export class ChatLog extends Container {
     this.toolById.clear();
     this.streamingAssistant = null;
     this.streamingRunId = null;
+    this.streamingText = null;
   }
 
   addSystem(text: string) {
@@ -30,6 +32,7 @@ export class ChatLog extends Container {
     const component = new AssistantMessageComponent(text);
     this.streamingAssistant = component;
     this.streamingRunId = runId ?? null;
+    this.streamingText = text;
     this.addChild(component);
     return component;
   }
@@ -42,17 +45,23 @@ export class ChatLog extends Container {
       this.startAssistant(text, runId);
       return;
     }
+    this.streamingText = text;
     this.streamingAssistant.setText(text);
   }
 
   finalizeAssistant(text: string, runId?: string) {
-    if (this.streamingAssistant && (!runId || runId === this.streamingRunId)) {
+    if (
+      this.streamingAssistant &&
+      (!runId || runId === this.streamingRunId || text === this.streamingText)
+    ) {
+      this.streamingText = text;
       this.streamingAssistant.setText(text);
     } else {
       this.startAssistant(text, runId);
     }
     this.streamingAssistant = null;
     this.streamingRunId = null;
+    this.streamingText = null;
   }
 
   startTool(toolCallId: string, toolName: string, args: unknown) {