feat!: Refine lifecycle hooks; fix abortSignal

- add `stop` method. agent can be reused after stopped
- agent can not be reused after disposed
- extension DO NOT exposes `dispose` anymore. only `stop`.
- update panel for new `stop` method
- fix MultiPageAgent dispose event
- better handling abortSignal

packages/extension/src/agent/MultiPageAgent.ts

@@ -89,8 +89,7 @@ export class MultiPageAgent extends PageAgentCore {
 					isAgentRunning: false,
 				})
 
-				// no need to dispose tabsController and pageController
-				// as they do not keep references
+				tabsController.dispose()
 			},
 		})
 	}