fix(project): stabilize project deletion

- Guard renderer project list/get against stale initial loads
- Retry project zip/cache removal to handle transient Windows locks
- Surface deletion failures in UI and add regression tests

Made-with: Cursor

app/renderer/editor/state/projectState.ts

@@ -58,12 +58,15 @@ export function useProjectState(licenseActive: boolean): readonly [State, Action
   const api = getDndApi();
   const [state, setState] = useState<State>({ projects: [], project: null, selectedSceneId: null });
   const projectRef = useRef<Project | null>(null);
+  /** Bumps on mutations / refresh; initial license load only applies if still current (avoids racing late list/get over newer state). */
+  const projectDataEpochRef = useRef(0);
   useEffect(() => {
     projectRef.current = state.project;
   }, [state.project]);
 
   const actions = useMemo<Actions>(() => {
     const refreshProjects = async () => {
+      projectDataEpochRef.current += 1;
       const res = await api.invoke(ipcChannels.project.list, {});
       setState((s) => ({ ...s, projects: res.projects }));
     };
@@ -75,6 +78,7 @@ export function useProjectState(licenseActive: boolean): readonly [State, Action
     };
 
     const openProject = async (id: ProjectId) => {
+      projectDataEpochRef.current += 1;
       const res = await api.invoke(ipcChannels.project.open, { projectId: id });
       setState((s) => ({ ...s, project: res.project, selectedSceneId: res.project.currentSceneId }));
     };
@@ -276,6 +280,7 @@ export function useProjectState(licenseActive: boolean): readonly [State, Action
     };
 
     const deleteProject = async (projectId: ProjectId) => {
+      projectDataEpochRef.current += 1;
       await api.invoke(ipcChannels.project.deleteProject, { projectId });
       const listRes = await api.invoke(ipcChannels.project.list, {});
       const res = await api.invoke(ipcChannels.project.get, {});
@@ -316,14 +321,18 @@ export function useProjectState(licenseActive: boolean): readonly [State, Action
   useEffect(() => {
     if (!licenseActive) {
       queueMicrotask(() => {
+        projectDataEpochRef.current += 1;
         setState({ projects: [], project: null, selectedSceneId: null });
       });
       return;
     }
     void (async () => {
+      const epoch = projectDataEpochRef.current;
       const listRes = await api.invoke(ipcChannels.project.list, {});
+      if (projectDataEpochRef.current !== epoch) return;
       setState((s) => ({ ...s, projects: listRes.projects }));
       const res = await api.invoke(ipcChannels.project.get, {});
+      if (projectDataEpochRef.current !== epoch) return;
       setState((s) => ({ ...s, project: res.project, selectedSceneId: res.project?.currentSceneId ?? null }));
     })();
   }, [licenseActive, api]);