feat: 表单库卡片改横版统一尺寸 + 日程页小月历背景融入与休息日区分

- 表单库：卡片网格改为固定 3 列等宽，aspectRatio 恢复 4/3 横版，缩略图字段数同步调回 2
- 日程页：小月历背景透明融入左侧容器，周六/周日表头与单元格红字、浅灰底区分休息日（选中保持蓝底白字）

client/src/pages/Schedule.tsx

@@ -359,8 +359,8 @@ export default function SchedulePage() {
           <span style={{ fontWeight: 600 }}>日程</span>
         </div>
 
-        {/* 小型月历 */}
-        <div style={{ padding: '8px 8px 4px' }}>
+        {/* 小型月历：背景融入容器，休息日（周六/周日）与工作日区分 */}
+        <div className="schedule-mini-calendar" style={{ padding: '8px 8px 4px' }}>
           <Calendar
             fullscreen={false}
             value={selectedDate}
@@ -405,6 +405,34 @@ export default function SchedulePage() {
               </div>
             )}
           />
+          <style>{`
+            /* 背景融入左侧容器（#f7f7f7） */
+            .schedule-mini-calendar .ant-picker-calendar,
+            .schedule-mini-calendar .ant-picker-panel {
+              background: transparent;
+            }
+            /* 表头休息日列（日/六）红色 */
+            .schedule-mini-calendar .ant-picker-content th:first-child,
+            .schedule-mini-calendar .ant-picker-content th:last-child {
+              color: #ff4d4f;
+            }
+            /* 休息日（周六/周日）浅灰底 + 红色日期，与工作日区分 */
+            .schedule-mini-calendar .ant-picker-content .ant-picker-cell:nth-child(7n+1):not(.ant-picker-cell-selected) .ant-picker-calendar-date,
+            .schedule-mini-calendar .ant-picker-content .ant-picker-cell:nth-child(7n+7):not(.ant-picker-cell-selected) .ant-picker-calendar-date {
+              background: #f0f0f0;
+            }
+            .schedule-mini-calendar .ant-picker-content .ant-picker-cell:nth-child(7n+1):not(.ant-picker-cell-selected) .ant-picker-calendar-date-value,
+            .schedule-mini-calendar .ant-picker-content .ant-picker-cell:nth-child(7n+7):not(.ant-picker-cell-selected) .ant-picker-calendar-date-value {
+              color: #ff4d4f;
+            }
+            /* 选中单元格保持高亮，不受休息日底色影响 */
+            .schedule-mini-calendar .ant-picker-content .ant-picker-cell-selected .ant-picker-calendar-date {
+              background: #1677ff;
+            }
+            .schedule-mini-calendar .ant-picker-content .ant-picker-cell-selected .ant-picker-calendar-date-value {
+              color: #fff;
+            }
+          `}</style>
           {/* 图例 */}
           <div
             style={{