feat(操作统计): 抽屉内增加独立时间筛选

- 抽屉内提供 今天/近7天/近30天/自定义 时间选择，默认同步顶部当前值
- 切换时间自动刷新统计与明细，无需关闭看板调整顶部时间

frontend/src/pages/admin/AdminDashboard.tsx

@@ -277,6 +277,9 @@ export default function AdminDashboard() {
   const [opFilterUsers, setOpFilterUsers] = useState<Set<string>>(new Set()); // 多选人员
   const [opFilterTouched, setOpFilterTouched] = useState(false); // 用户是否主动操作过筛选
   const [opSort, setOpSort] = useState<{ key: string; order: "asc" | "desc" } | null>(null);
+  // 抽屉内独立时间筛选（不依赖顶部）
+  const [opDateKey, setOpDateKey] = useState<DateRangeKey>("today");
+  const [opCustomRange, setOpCustomRange] = useState<[Dayjs, Dayjs] | null>(null);
   // 操作明细下钻
   const [opDetailOpen, setOpDetailOpen] = useState(false);
   const [opDetailList, setOpDetailList] = useState<OperationDetail[]>([]);
@@ -337,22 +340,28 @@ export default function AdminDashboard() {
       .finally(() => setRejectedLoading(false));
   };
 
-  // 人员操作统计 — 跟随顶部时间筛选（打开抽屉时加载）
+  // 人员操作统计 — 用抽屉内独立时间筛选
   const loadUserOperations = useCallback(() => {
     setOpLoading(true);
-    const { since, until } = rangeToParams(dateKey, customRange);
+    const { since, until } = rangeToParams(opDateKey, opCustomRange);
     fetchUserOperations(since, until)
       .then(setOpStats)
       .catch(() => setOpStats([]))
       .finally(() => setOpLoading(false));
-  }, [dateKey, customRange]);
+  }, [opDateKey, opCustomRange]);
+
+  // 抽屉打开或内部时间变化时加载
+  useEffect(() => {
+    if (opsDrawerOpen) loadUserOperations();
+  }, [opsDrawerOpen, loadUserOperations]);
 
   const openOpsDrawer = () => {
     setOpsDrawerOpen(true);
+    setOpDateKey(dateKey);          // 默认同步顶部当前时间
+    setOpCustomRange(customRange);
     setOpFilterUsers(new Set());
     setOpFilterTouched(false);
     setOpSort(null);
-    loadUserOperations();
   };
 
   // 首次加载完成后默认全选（显示全部）；用户操作过筛选后不再自动覆盖
@@ -390,12 +399,12 @@ export default function AdminDashboard() {
     });
   };
 
-  // 点击数字下钻查看明细
+  // 点击数字下钻查看明细（跟随抽屉内时间）
   const openOpDetail = (user: UserOperation, actionType: string, label: string) => {
     setOpDetailOpen(true);
     setOpDetailTitle(`${user.user_name} · ${label}`);
     setOpDetailLoading(true);
-    const { since, until } = rangeToParams(dateKey, customRange);
+    const { since, until } = rangeToParams(opDateKey, opCustomRange);
     fetchOperationDetail(user.user_id, actionType, since, until)
       .then(setOpDetailList)
       .catch(() => setOpDetailList([]))
@@ -740,6 +749,31 @@ export default function AdminDashboard() {
         size="large"
         styles={{ body: { padding: 16, background: "#f8fafc" } }}
       >
+        {/* 抽屉内时间筛选 */}
+        <div className="mb-4 flex flex-wrap items-center gap-2">
+          <Radio.Group
+            value={opDateKey}
+            onChange={e => { setOpDateKey(e.target.value); setOpCustomRange(null); }}
+            size="small"
+            optionType="button"
+            buttonStyle="solid"
+          >
+            <Radio.Button value="today">今天</Radio.Button>
+            <Radio.Button value="7d">近7天</Radio.Button>
+            <Radio.Button value="30d">近30天</Radio.Button>
+            <Radio.Button value="custom">自定义</Radio.Button>
+          </Radio.Group>
+          {opDateKey === "custom" && (
+            <RangePicker
+              size="small"
+              value={opCustomRange as any}
+              onChange={dates => setOpCustomRange(dates as [Dayjs, Dayjs] | null)}
+              style={{ width: 240 }}
+              placeholder={["开始", "结束"]}
+            />
+          )}
+        </div>
+
         {/* 人员选择 — 人名宫格多选 */}
         <div className="mb-4">
           <div className="mb-2 flex items-center justify-between">