feat(tasks): 切换页加「获取最新任务中」刷新状态 + 旋转动画，1.2s 后切换

- TaskDisplay.jsx：displayedPage 与 page 分离，页切换先置 switching 展示加载遮罩，SWITCH_MS(1200ms) 后再切到新页；task_refresh 亦播放一次。
- task-display.css：tasks-screen position:relative；+ tasks-switch-overlay / tasks-spinner(旋转) / tasks-switch-text。

Co-Authored-By: Claude <noreply@anthropic.com>

src/pages/TaskDisplay.jsx

@@ -43,6 +43,9 @@ export default function TaskDisplay() {
   const pageSize = cols * ROWS;   // 2×2=4 或 2×3=6
   const pageCount = Math.max(1, Math.ceil(tasks.length / pageSize));
   const [countdown, setCountdown] = useState(Math.round(ROTATE_MS / 1000));
+  // 切换：page 为目标页，displayedPage 为当前展示页；切换时先显示「获取最新任务中」动画，1-2 秒后再切
+  const [displayedPage, setDisplayedPage] = useState(0);
+  const [switching, setSwitching] = useState(false);
   useEffect(() => {
     if (pageCount <= 1) { setPage(0); return; }
     const t = setInterval(() => setPage((p) => (p + 1) % pageCount), ROTATE_MS);
@@ -56,13 +59,30 @@ export default function TaskDisplay() {
     return () => clearInterval(t);
   }, []);
 
+  // 页切换 → 显示加载动画，SWITCH_MS 后再切到新页
+  const SWITCH_MS = 1200;
+  useEffect(() => {
+    if (page === displayedPage) return;
+    setSwitching(true);
+    const t = setTimeout(() => { setDisplayedPage(page); setSwitching(false); }, SWITCH_MS);
+    return () => clearTimeout(t);
+  }, [page, displayedPage]);
+
+  // 手动/任务刷新 → 同样播放一次「获取最新任务中」
+  useEffect(() => {
+    if (refreshTick === 0) return;
+    setSwitching(true);
+    const t = setTimeout(() => setSwitching(false), SWITCH_MS);
+    return () => clearTimeout(t);
+  }, [refreshTick]);
+
   const visible = useMemo(() => {
     if (tasks.length === 0) return [];
-    const start = page * pageSize;
+    const start = displayedPage * pageSize;
     // 不足一页时按行补位（循环取），保证 2 行填满
     const items = tasks.slice(start, start + pageSize);
     return items.length ? items : Array.from({ length: pageSize }, (_, i) => tasks[i % tasks.length]);
-  }, [tasks, page, pageSize]);
+  }, [tasks, displayedPage, pageSize]);
 
   return (
     <div className="tasks-screen">
@@ -76,7 +96,7 @@ export default function TaskDisplay() {
           <span className="tasks-info-sep">·</span>
           <span className="tasks-info">翻页 <b>{pageCount > 1 ? `${countdown}s` : '—'}</b></span>
           <span className="tasks-info-sep">·</span>
-          <span className="tasks-info">页码 <b>{pageCount > 1 ? `${page + 1}/${pageCount}` : '1/1'}</b></span>
+          <span className="tasks-info">页码 <b>{pageCount > 1 ? `${displayedPage + 1}/${pageCount}` : '1/1'}</b></span>
           <span className="tasks-info-sep">·</span>
           <span className="tasks-info hint">接单：抢单·竞标·指派·推荐</span>
         </div>
@@ -99,10 +119,17 @@ export default function TaskDisplay() {
           {pageCount > 1 && (
             <div className="tasks-dots">
               {Array.from({ length: pageCount }).map((_, i) => (
-                <span key={i} className={i === page ? 'tasks-dot on' : 'tasks-dot'} />
+                <span key={i} className={i === displayedPage ? 'tasks-dot on' : 'tasks-dot'} />
               ))}
             </div>
           )}
+          {/* 切换/刷新加载遮罩 */}
+          {switching && (
+            <div className="tasks-switch-overlay">
+              <span className="tasks-spinner" />
+              <span className="tasks-switch-text">获取最新任务中…</span>
+            </div>
+          )}
         </>
       )}
     </div>

src/styles/task-display.css

@@ -8,6 +8,7 @@
   width: 100%;
   height: 100%;
   overflow: hidden;
+  position: relative;   /* 供切换加载遮罩定位于此 */
   background: radial-gradient(ellipse at 20% 0%, rgba(79, 135, 255, 0.08), transparent 55%),
     radial-gradient(ellipse at 80% 100%, rgba(23, 178, 106, 0.06), transparent 55%);
 }
@@ -115,3 +116,35 @@
 .task-dots { display: flex; justify-content: center; gap: 8px; padding-bottom: 6px; }
 .task-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(29, 44, 68, 0.15); transition: all 0.25s; }
 .task-dot.on { background: var(--bd-blue, #2f6bff); width: 20px; border-radius: 999px; }
+
+/* ---- 切换/刷新加载遮罩：文字(获取最新任务中) + 旋转动画 ---- */
+.tasks-switch-overlay {
+  position: absolute;
+  inset: 0;
+  z-index: 5;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 14px;
+  background: rgba(255, 255, 255, 0.72);
+  backdrop-filter: blur(4px);
+  -webkit-backdrop-filter: blur(4px);
+}
+.tasks-spinner {
+  width: 42px;
+  height: 42px;
+  border-radius: 50%;
+  border: 4px solid rgba(47, 107, 255, 0.18);
+  border-top-color: var(--bd-blue, #2f6bff);
+  animation: tasks-spin 0.8s linear infinite;
+}
+.tasks-switch-text {
+  font-size: 15px;
+  font-weight: 600;
+  color: var(--bd-blue, #2f6bff);
+  letter-spacing: 0.05em;
+}
+@keyframes tasks-spin {
+  to { transform: rotate(360deg); }
+}