Add toolbox spaces and recover from stale asset bundles

tests/persistence-queue.test.mjs

@@ -137,6 +137,32 @@ test("global imports started from the same render both survive", async () => {
   assert.deepEqual(queue.getCurrent(), disk);
 });
 
+test("v2 imports reject more than five spaces before writing", async () => {
+  let writes = 0;
+  let errorMessage = "";
+  const actions = useToolboxActions({
+    store: {
+      ready: true,
+      persistToolboxSnapshot: () => { writes += 1; return Promise.resolve(true); }
+    },
+    notify() {},
+    setConfirmModal: (value) => { errorMessage = value.message; }
+  });
+  const result = await actions.importToolbox({ text: async () => JSON.stringify({
+    version: 2,
+    toolbox: {
+      id: "overflow",
+      name: "Overflow",
+      modules: [],
+      spaces: Array.from({ length: 6 }, (_, index) => ({ id: `space-${index}`, name: `Space ${index}`, moduleOrder: { one: [], two: [[], []] } }))
+    },
+    modules: {}
+  }) });
+  assert.equal(result, null);
+  assert.equal(writes, 0);
+  assert.match(errorMessage, /plus de 5 espaces/);
+});
+
 test("failed toolbox deletion preserves registry links and modules together", async () => {
   const initial = {
     toolboxes: [{ id: "existing", modules: [{ id: "note", type: "notepad" }] }],