fix(ProjectManagement): remove temporary task filter causing UI inconsistency

The filter was incorrectly keeping temporary tasks during creation, leading to duplicate entries and UI state issues when server sync completes. This ensures tasks are properly filtered based on server state.

Author: asepindrak

frontend/src/components/ProjectManagement.tsx

@@ -1495,9 +1495,6 @@ export default function ProjectManagement({
         const id = nid(lt.id);
         const cid = nid((lt as any).clientId);
 
-        // If creatingTask is true and this is a tmp task, definitely keep it!
-        if (creatingTask && id.startsWith("tmp_")) return true;
-
         return !serverIds.has(id) && (!cid || !serverClientIds.has(cid));
       });