Update plan property references in chat and service

Replaced usage of 'description' with 'initial_goal' in PlanChat component and updated plan status check from 'status' to 'overall_status' in TaskService. These changes align with updated plan data structure.

Author: Fr4nc3

src/frontend/src/components/content/PlanChat.tsx

@@ -180,10 +180,10 @@ const PlanChat: React.FC<SimplifiedPlanChatProps> = ({
     }
 
     // Check planData
-    if (planData?.plan?.description &&
-      planData.plan.description.trim() &&
-      planData.plan.description !== 'Task submitted') {
-      return planData.plan.description.trim();
+    if (planData?.plan?.initial_goal &&
+      planData.plan.initial_goal.trim() &&
+      planData.plan.initial_goal !== 'Task submitted') {
+      return planData.plan.initial_goal.trim();
     }
 
     // Default fallback

src/frontend/src/services/TaskService.tsx

@@ -39,7 +39,7 @@ export class TaskService {
 
       // Categorize based on plan status and completion
       if (
-        plan.status === PlanStatus.COMPLETED ||
+        plan.overall_status === PlanStatus.COMPLETED ||
         PlanDataService.isPlanComplete(plan)
       ) {
         completed.push(task);