refactor(agent): print file paths and improve reset state functionality

- Print beforeFilePath and afterFilePath for debugging purposes
- Refactor resetState function to use a val for syncPublisher
- Add call to onUpdateChange method in resetState

Author: phodal

core/src/main/kotlin/cc/unitmesh/devti/observer/agent/AgentStateService.kt

@@ -193,9 +193,11 @@ class AgentStateService(val project: Project) {
 
     fun resetState() {
         state = AgentState()
-        ApplicationManager.getApplication().messageBus
+        val syncPublisher = ApplicationManager.getApplication().messageBus
             .syncPublisher(PlanUpdateListener.TOPIC)
-            .onPlanUpdate(mutableListOf())
+
+        syncPublisher.onUpdateChange(mutableListOf())
+        syncPublisher.onPlanUpdate(mutableListOf())
     }
 
     fun getPlan(): MutableList<AgentTaskEntry> {