fix: clean up event listeners in PageAgent dispose method

Co-authored-by: gaomeng1900 <10131203+gaomeng1900@users.noreply.github.com>

packages/page-agent/src/PageAgent.ts

@@ -78,6 +78,8 @@ export class PageAgent extends EventTarget {
 	#llm: LLM
 	#totalWaitTime = 0
 	#abortController = new AbortController()
+	#llmRetryListener: ((e: Event) => void) | null = null
+	#llmErrorListener: ((e: Event) => void) | null = null
 
 	/** PageController for DOM operations */
 	pageController: PageController
@@ -108,14 +110,16 @@ export class PageAgent extends EventTarget {
 		this.pageController = new PageController(this.config)
 
 		// Listen to LLM events
-		this.#llm.addEventListener('retry', (e) => {
+		this.#llmRetryListener = (e) => {
 			const { current, max } = (e as CustomEvent).detail
 			this.panel.update({ type: 'retry', current, max })
-		})
-		this.#llm.addEventListener('error', (e) => {
+		}
+		this.#llmErrorListener = (e) => {
 			const { error } = (e as CustomEvent).detail
 			this.panel.update({ type: 'error', message: `step failed: ${error.message}` })
-		})
+		}
+		this.#llm.addEventListener('retry', this.#llmRetryListener)
+		this.#llm.addEventListener('error', this.#llmErrorListener)
 
 		if (this.config.customTools) {
 			for (const [name, tool] of Object.entries(this.config.customTools)) {
@@ -491,6 +495,16 @@ export class PageAgent extends EventTarget {
 		this.history = []
 		this.#abortController.abort(reason ?? 'PageAgent disposed')
 
+		// Clean up LLM event listeners
+		if (this.#llmRetryListener) {
+			this.#llm.removeEventListener('retry', this.#llmRetryListener)
+			this.#llmRetryListener = null
+		}
+		if (this.#llmErrorListener) {
+			this.#llm.removeEventListener('error', this.#llmErrorListener)
+			this.#llmErrorListener = null
+		}
+
 		this.config.onDispose?.call(this, reason)
 	}
 }