feat(update-center): 添加加载状态处理及UI优化

为更新中心添加加载状态管理，包括：
- 在打开和刷新操作时显示加载状态
- 禁用刷新按钮防止重复操作
- 添加加载中的动画效果和提示文本
- 优化加载时的UI显示

electron/main/backend/update-center/index.ts

@@ -191,7 +191,14 @@ const loadAptssItemMetadata = async (
   }
 
   const metadata = parsePrintUrisOutput(metadataResult.stdout);
+  if (metadata) {
+    console.log(`[DEBUG] APTSS parsed metadata:`, {
+      ...metadata,
+      downloadUrl: `${metadata.downloadUrl}.metalink`,
+    });
+  } else {
     console.log(`[DEBUG] APTSS parsed metadata:`, metadata);
+  }
 
   if (!metadata) {
     return {

src/__tests__/unit/update-center/UpdateCenterModal.test.ts

@@ -63,6 +63,7 @@ const createStore = (
 
   return {
     isOpen: ref(true),
+    loading: ref(false),
     showCloseConfirm: ref(true),
     showMigrationConfirm: ref(false),
     searchQuery: ref(""),
@@ -220,4 +221,52 @@ describe("UpdateCenterModal", () => {
 
     expect(store.requestClose).toHaveBeenCalledTimes(1);
   });
+
+  it("shows loading panel when loading with no items", () => {
+    const store = createStore({
+      items: [],
+      tasks: [],
+      warnings: [],
+      hasRunningTasks: false,
+    });
+    store.loading.value = true;
+
+    render(UpdateCenterModal, {
+      props: {
+        show: true,
+        store,
+      },
+    });
+
+    expect(screen.getByText("正在检查更新…")).toBeTruthy();
+  });
+
+  it("shows refresh hint while loading with existing items", () => {
+    const store = createStore({ hasRunningTasks: false });
+    store.loading.value = true;
+
+    render(UpdateCenterModal, {
+      props: {
+        show: true,
+        store,
+      },
+    });
+
+    expect(screen.getByText("Spark Weather")).toBeTruthy();
+    expect(screen.getByText("正在刷新更新列表…")).toBeTruthy();
+  });
+
+  it("disables refresh button while loading", () => {
+    const store = createStore({ hasRunningTasks: false });
+    store.loading.value = true;
+
+    render(UpdateCenterModal, {
+      props: {
+        show: true,
+        store,
+      },
+    });
+
+    expect(screen.getByRole("button", { name: /刷新/ })).toBeDisabled();
+  });
 });

src/__tests__/unit/update-center/store.test.ts

@@ -61,10 +61,16 @@ describe("updateCenter store", () => {
     open.mockResolvedValue(snapshot);
     const store = createUpdateCenterStore();
 
-    await store.open("apm");
+    const openPromise = store.open("apm");
+
+    expect(store.isOpen.value).toBe(true);
+    expect(store.loading.value).toBe(true);
+
+    await openPromise;
 
     expect(open).toHaveBeenCalledWith("apm");
     expect(store.isOpen.value).toBe(true);
+    expect(store.loading.value).toBe(false);
     expect(store.snapshot.value).toEqual(snapshot);
     expect(store.filteredItems.value).toEqual(snapshot.items);
   });
@@ -76,7 +82,12 @@ describe("updateCenter store", () => {
     const store = createUpdateCenterStore();
 
     await store.open("apm");
-    await store.refresh();
+
+    const refreshPromise = store.refresh();
+    expect(store.loading.value).toBe(true);
+
+    await refreshPromise;
+    expect(store.loading.value).toBe(false);
 
     expect(refresh).toHaveBeenCalledWith("apm");
   });
@@ -209,11 +220,13 @@ describe("updateCenter store", () => {
   it("blocks close requests while the snapshot reports running tasks", () => {
     const store = createUpdateCenterStore();
     store.isOpen.value = true;
+    store.loading.value = true;
     store.snapshot.value = createSnapshot({ hasRunningTasks: true });
 
     store.requestClose();
 
     expect(store.isOpen.value).toBe(false);
+    expect(store.loading.value).toBe(false);
     expect(store.showCloseConfirm.value).toBe(false);
   });
 

src/components/UpdateCenterModal.vue

@@ -22,6 +22,7 @@
           :selected-count="selectedCount"
           :all-selected="store.allSelected.value"
           :some-selected="store.someSelected.value"
+          :loading="store.loading.value"
           @refresh="store.refresh"
           @start-selected="emit('request-start-selected')"
           @request-close="store.requestClose"
@@ -42,6 +43,22 @@
           </p>
         </div>
 
+        <div
+          v-if="store.loading.value && store.filteredItems.value.length === 0"
+          class="flex min-h-0 flex-1 items-center justify-center p-6"
+        >
+          <div class="flex flex-col items-center gap-3 text-slate-500 dark:text-slate-400">
+            <i class="fas fa-circle-notch fa-spin text-3xl"></i>
+            <p class="text-sm">正在检查更新…</p>
+          </div>
+        </div>
+        <template v-else>
+          <div
+            v-if="store.loading.value && store.filteredItems.value.length > 0"
+            class="border-b border-slate-200/70 px-6 py-2 text-center text-xs text-slate-400 dark:border-slate-800/70 dark:text-slate-500"
+          >
+            正在刷新更新列表…
+          </div>
           <div class="flex min-h-0 flex-1">
             <UpdateCenterList
               :items="store.filteredItems.value"
@@ -52,6 +69,7 @@
               @unignore-item="store.unignoreItem"
             />
           </div>
+        </template>
 
         <UpdateCenterMigrationConfirm
           :show="store.showMigrationConfirm.value"

src/components/update-center/UpdateCenterToolbar.vue

@@ -14,11 +14,12 @@
       <div class="flex items-center gap-2">
         <button
           type="button"
-          class="inline-flex items-center gap-2 rounded-2xl border border-slate-200/70 px-4 py-2 text-sm font-semibold text-slate-600 transition hover:bg-slate-50 dark:border-slate-700 dark:text-slate-200 dark:hover:bg-slate-800"
+          class="inline-flex items-center gap-2 rounded-2xl border border-slate-200/70 px-4 py-2 text-sm font-semibold text-slate-600 transition hover:bg-slate-50 disabled:opacity-40 dark:border-slate-700 dark:text-slate-200 dark:hover:bg-slate-800"
+          :disabled="loading"
           @click="$emit('refresh')"
         >
-          <i class="fas fa-sync-alt"></i>
-          刷新
+          <i class="fas fa-sync-alt" :class="{ 'animate-spin': loading }"></i>
+          {{ loading ? "刷新中" : "刷新" }}
         </button>
         <button
           type="button"
@@ -88,6 +89,7 @@ const props = defineProps<{
   selectedCount: number;
   allSelected: boolean;
   someSelected: boolean;
+  loading?: boolean;
 }>();
 
 const emit = defineEmits<{

src/modules/updateCenter.ts

@@ -19,6 +19,7 @@ const EMPTY_SNAPSHOT: UpdateCenterSnapshot = {
 
 export interface UpdateCenterStore {
   isOpen: Ref<boolean>;
+  loading: Ref<boolean>;
   showCloseConfirm: Ref<boolean>;
   showMigrationConfirm: Ref<boolean>;
   searchQuery: Ref<string>;
@@ -54,6 +55,7 @@ const matchesSearch = (item: UpdateCenterItem, query: string): boolean => {
 
 export const createUpdateCenterStore = (): UpdateCenterStore => {
   const isOpen = ref(false);
+  const loading = ref(false);
   const showCloseConfirm = ref(false);
   const showMigrationConfirm = ref(false);
   const searchQuery = ref("");
@@ -134,17 +136,27 @@ export const createUpdateCenterStore = (): UpdateCenterStore => {
   const open = async (storeFilter: StoreFilter = "both"): Promise<void> => {
     lastStoreFilter = storeFilter;
     resetSessionState();
+    isOpen.value = true;
+    loading.value = true;
+    try {
       const nextSnapshot = await window.updateCenter.open(storeFilter);
       applySnapshot(nextSnapshot);
-    isOpen.value = true;
+    } finally {
+      loading.value = false;
+    }
   };
 
   const refresh = async (
     storeFilter: StoreFilter = lastStoreFilter,
   ): Promise<void> => {
     lastStoreFilter = storeFilter;
+    loading.value = true;
+    try {
       const nextSnapshot = await window.updateCenter.refresh(storeFilter);
       applySnapshot(nextSnapshot);
+    } finally {
+      loading.value = false;
+    }
   };
 
   const ignoreItem = async (
@@ -197,6 +209,7 @@ export const createUpdateCenterStore = (): UpdateCenterStore => {
 
   const closeNow = (): void => {
     resetSessionState();
+    loading.value = false;
     isOpen.value = false;
   };
 
@@ -270,6 +283,7 @@ export const createUpdateCenterStore = (): UpdateCenterStore => {
 
   return {
     isOpen,
+    loading,
     showCloseConfirm,
     showMigrationConfirm,
     searchQuery,