fix: harden favorites storage recovery

tests/favorites-store.test.ts

@@ -154,7 +154,7 @@ describe("favorites-store", () => {
   test("recovers from malformed, duplicate, and dangling stored values", async () => {
     const { repository } = createRepository(
       createMemoryStorage({
-        version: 42,
+        version: 1,
         folders: [
           {
             id: "folder-1",
@@ -214,6 +214,44 @@ describe("favorites-store", () => {
     });
   });
 
+  test("treats a future stored version as an empty V1 state", async () => {
+    const { repository } = createRepository(
+      createMemoryStorage({
+        version: 2,
+        folders: [
+          {
+            id: "future-folder",
+            name: "未来收藏夹",
+            createdAt: "future",
+            updatedAt: "future"
+          }
+        ],
+        creators: [
+          {
+            authorId: "future-author",
+            authorName: "Future",
+            savedAt: "future"
+          }
+        ],
+        memberships: [
+          {
+            folderId: "future-folder",
+            authorId: "future-author",
+            addedAt: "future"
+          }
+        ],
+        futureOnlyField: "do not retain"
+      })
+    );
+
+    await expect(repository.read()).resolves.toEqual({
+      creators: [],
+      folders: [],
+      memberships: [],
+      version: 1
+    });
+  });
+
   test("serializes concurrent mutations so neither folder is overwritten", async () => {
     const { repository } = createRepository();
 
@@ -230,18 +268,40 @@ describe("favorites-store", () => {
     });
   });
 
-  test("propagates rejected storage writes", async () => {
+  test("recovers the mutation queue after one rejected storage write", async () => {
+    let writeAttempts = 0;
+    let storedState: FavoritesStateV1 | undefined;
     const storage: FavoritesStorage = {
       async get() {
-        return undefined;
+        return storedState;
       },
-      async set() {
-        throw new Error("write failed");
+      async set(value) {
+        writeAttempts += 1;
+        if (writeAttempts === 1) {
+          throw new Error("write failed");
+        }
+        storedState = value;
       }
     };
     const { repository } = createRepository(storage);
 
     await expect(repository.createFolder("合作")).rejects.toThrow("write failed");
+    await expect(repository.createFolder("待联系")).resolves.toMatchObject({
+      name: "待联系"
+    });
+    await expect(repository.read()).resolves.toEqual({
+      creators: [],
+      folders: [
+        {
+          id: "folder-2",
+          name: "待联系",
+          createdAt: "2026-07-17T00:00:00.000Z",
+          updatedAt: "2026-07-17T00:00:00.000Z"
+        }
+      ],
+      memberships: [],
+      version: 1
+    });
   });
 
   test("uses the exact Chrome storage key and reports unavailable storage", async () => {