feat(favorites): add cloud favorite management

src/__tests__/unit/FavoriteFolderManager.test.ts

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+import { fireEvent, render, screen } from "@testing-library/vue";
+import { describe, expect, it } from "vitest";
+
+import FavoriteFolderManager from "@/components/FavoriteFolderManager.vue";
+import type {
+  FavoriteFolder,
+  ResolvedFavoriteItem,
+} from "@/global/typedefinition";
+
+const folder: FavoriteFolder = {
+  id: 1,
+  name: "默认收藏夹",
+  itemCount: 1,
+  createdAt: "2026-05-18T00:00:00Z",
+  updatedAt: "2026-05-18T00:00:00Z",
+};
+
+const item: ResolvedFavoriteItem = {
+  item: {
+    id: 2,
+    appKey: "app:office:wps",
+    pkgname: "wps",
+    name: "WPS",
+    category: "office",
+    iconUrl: "",
+    createdAt: "2026-05-18T00:00:00Z",
+  },
+  status: "downlisted",
+  reason: "已下架",
+  selectedApp: null,
+};
+
+describe("FavoriteFolderManager", () => {
+  it("shows downlisted favorites and emits bulk delete", async () => {
+    const rendered = render(FavoriteFolderManager, {
+      props: {
+        folders: [folder],
+        activeFolderId: 1,
+        items: [item],
+        loading: false,
+        error: "",
+      },
+    });
+
+    expect(screen.getByText("已下架")).toBeTruthy();
+    await fireEvent.click(screen.getByLabelText("选择 WPS"));
+    await fireEvent.click(screen.getByRole("button", { name: "移除选中" }));
+
+    expect(rendered.emitted("remove-selected")?.[0]?.[0]).toEqual([2]);
+  });
+});

src/__tests__/unit/favoriteAvailability.test.ts

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+import { describe, expect, it } from "vitest";
+
+import { resolveFavoriteItems } from "@/modules/favoriteAvailability";
+import type { App, FavoriteItem } from "@/global/typedefinition";
+
+const app = (origin: "spark" | "apm", overrides: Partial<App> = {}): App => ({
+  name: "WPS",
+  pkgname: "wps",
+  version: "1.0.0",
+  filename: "wps_1.0.0_amd64.deb",
+  torrent_address: "",
+  author: "",
+  contributor: "",
+  website: "",
+  update: "",
+  size: "",
+  more: "",
+  tags: "",
+  img_urls: [],
+  icons: "",
+  category: "office",
+  origin,
+  currentStatus: "not-installed",
+  arch: "amd64",
+  ...overrides,
+});
+
+const favorite: FavoriteItem = {
+  id: 1,
+  appKey: "app:office:wps",
+  pkgname: "wps",
+  name: "WPS",
+  category: "office",
+  iconUrl: "",
+  createdAt: "2026-05-18T00:00:00Z",
+};
+
+describe("favoriteAvailability", () => {
+  it("marks downlisted favorites", () => {
+    expect(
+      resolveFavoriteItems(
+        [favorite],
+        [],
+        [],
+        { spark: true, apm: true },
+        "both",
+      )[0].status,
+    ).toBe("downlisted");
+  });
+
+  it("selects preferred installable variant", () => {
+    const resolved = resolveFavoriteItems(
+      [favorite],
+      [app("spark"), app("apm")],
+      [],
+      { spark: true, apm: true },
+      "both",
+    )[0];
+    expect(resolved.status).toBe("installable");
+    expect(resolved.selectedApp?.origin).toBe("apm");
+  });
+
+  it("marks installed favorites", () => {
+    const resolved = resolveFavoriteItems(
+      [favorite],
+      [app("apm")],
+      [app("apm", { currentStatus: "installed" })],
+      { spark: true, apm: true },
+      "both",
+    )[0];
+    expect(resolved.status).toBe("installed");
+  });
+});