feat: improve date format and error message for llm

packages/core/src/PageAgentCore.ts

@@ -515,7 +515,7 @@ export class PageAgentCore extends EventTarget {
 			</user_request>
 			<step_info>
 			Step ${stepCount + 1} of ${this.config.maxSteps} max possible steps
-			Current date and time: ${new Date().toISOString()}
+			Current date and time: ${new Date().toLocaleString()}
 			</step_info>
 			</agent_state>
 		`

packages/page-controller/src/PageController.ts

@@ -227,7 +227,7 @@ export class PageController extends EventTarget {
 	 */
 	private assertIndexed(): void {
 		if (!this.isIndexed) {
-			throw new Error('DOM tree not indexed. Can not perform actions on elements.')
+			throw new Error('DOM tree not indexed yet. Can not perform actions on elements.')
 		}
 	}