R62 Fix A1-A6：请假预览全非工作日处理

client/src/api/leave.ts

@@ -90,6 +90,7 @@ export type LeaveWorkingDaysPreview = {
   weekendDayCount: number;
   adjustedWorkdayCount: number;
   calendarApplied: boolean;
+  isNonWorkingRange: boolean;
 };
 
 export type LeaveListQuery = {

client/src/pages/LeaveRequestPage.tsx

@@ -303,6 +303,7 @@ export function LeaveRequestPage() {
 
   const effectiveRequestedDaysPreview =
     workingDaysPreviewQuery.data?.requestedDays ?? localRequestedDaysPreview;
+  const isNonWorkingPreview = Boolean(workingDaysPreviewQuery.data?.isNonWorkingRange);
 
   const balanceSummary = useMemo(() => {
     return (balancesQuery.data?.items ?? []).reduce(
@@ -784,7 +785,15 @@ export function LeaveRequestPage() {
               </p>
             ) : null}
 
-            {workingDaysPreviewQuery.data && workingDaysPreviewQuery.data.holidayDayCount > 0 ? (
+            {isNonWorkingPreview ? (
+              <p className="rounded-lg border border-zinc-200 bg-zinc-50 px-3 py-2 text-sm text-zinc-700">
+                所选日期范围均为非工作日，无需提交请假
+              </p>
+            ) : null}
+
+            {workingDaysPreviewQuery.data &&
+            !isNonWorkingPreview &&
+            workingDaysPreviewQuery.data.holidayDayCount > 0 ? (
               <p className="rounded-lg border border-sky-200 bg-sky-50 px-3 py-2 text-sm text-sky-700">
                 选择的日期范围内包含 {workingDaysPreviewQuery.data.holidayDayCount} 天法定假日，实际请假天数为{" "}
                 {workingDaysPreviewQuery.data.requestedDays} 天
@@ -893,7 +902,7 @@ export function LeaveRequestPage() {
                 ) : null}
                 <Button
                   type="button"
-                  disabled={isSavingForm}
+                  disabled={isSavingForm || isNonWorkingPreview}
                   onClick={() => {
                     if (editingLeaveRequest) {
                       updateMutation.mutate();