Fix project.deleted handler to clean up thread index maps

Clean up threadIdsByProjectId and sidebarThreadsById entries when a
project is deleted, preventing stale index entries if thread.deleted
events don't arrive before or alongside the project deletion.

Author: cursoragent

apps/web/src/store.ts

@@ -637,8 +637,22 @@ export function applyOrchestrationEvent(state: AppState, event: OrchestrationEve
     }
 
     case "project.deleted": {
-      const projects = state.projects.filter((project) => project.id !== event.payload.projectId);
-      return projects.length === state.projects.length ? state : { ...state, projects };
+      const deletedProjectId = event.payload.projectId;
+      const projects = state.projects.filter((project) => project.id !== deletedProjectId);
+      if (projects.length === state.projects.length) {
+        return state;
+      }
+      const orphanedThreadIds = state.threadIdsByProjectId[deletedProjectId];
+      if (!orphanedThreadIds || orphanedThreadIds.length === 0) {
+        const { [deletedProjectId]: _, ...threadIdsByProjectId } = state.threadIdsByProjectId;
+        return _ ? { ...state, projects, threadIdsByProjectId } : { ...state, projects };
+      }
+      const { [deletedProjectId]: _, ...threadIdsByProjectId } = state.threadIdsByProjectId;
+      const sidebarThreadsById = { ...state.sidebarThreadsById };
+      for (const threadId of orphanedThreadIds) {
+        delete sidebarThreadsById[threadId];
+      }
+      return { ...state, projects, threadIdsByProjectId, sidebarThreadsById };
     }
 
     case "thread.created": {