fix: style FullCalendar buttons as white-outlined to match matrix view

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/pages/clazz/index.vue

@@ -1114,6 +1114,36 @@ export default defineComponent({
     overflow-y: auto !important;
     -webkit-overflow-scrolling: touch;
   }
+
+  // FullCalendar 按钮统一为白底描线，与矩阵视图一致
+  :deep(.fc .fc-button-primary) {
+    background: #fff;
+    border: 1px solid #c8c9cc;
+    color: #333;
+    font-size: 0.24rem;
+    height: 0.5rem;
+    padding: 0 0.15rem;
+    border-radius: 0.06rem;
+    box-shadow: none;
+    text-shadow: none;
+    line-height: 1;
+    white-space: nowrap;
+
+    &:hover { background: #f7f8fa; }
+    &:active { background: #e8e8e8; }
+    &:focus { box-shadow: none; }
+  }
+
+  :deep(.fc .fc-button-primary:disabled) {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
+
+  :deep(.fc .fc-button-primary.fc-button-active) {
+    background: #1989fa;
+    border-color: #1989fa;
+    color: #fff;
+  }
 }
 
 .calendar-wrapper {