feat: enhance daemon dispatching, device readiness fallback, and live streaming UI

- Admin Console & Task Queue: add cancellation, session startup progress endpoints, and support ingress metadata
- Diagnostics & Runtime: enhance ADB probe to prefer unlocked devices and synchronize with readiness engine
- MCP Server: dispatch tasks through Artemis Daemon scheduler with fallback to standalone runner, improve action overlays
- Showcase UI: improve session auto-selection with pinning support, render startup progress, and refine stream styling
- CLI & Makefile: expose server lifecycle commands (restart, stop, status)
- Configuration: ignore runtime server state file in .gitignore

apps/showcase_ui/src/app/components/chat-interface/chat-interface.component.ts

@@ -98,6 +98,19 @@ export class ChatInterfaceComponent {
     });
   }
 
+  /**
+   * Stop an individual task session
+   */
+  public stopTask(sessionId: string, event: MouseEvent): void {
+    event.stopPropagation();
+    this.isSubmitting = true;
+    this.errorMessage = null;
+    this.agentService.stopTask(sessionId, false);
+    setTimeout(() => {
+      this.isSubmitting = false;
+    }, 400);
+  }
+
   /**
    * Stop the currently running task and optionally clear the backend queue
    */