feat: improve a11y when table header is empty

Author: aojunhao123

src/PickerPanel/DatePanel/index.tsx

@@ -98,7 +98,13 @@ export default function DatePanel<DateType extends object = any>(props: DatePane
       : []);
 
   if (prefixColumn) {
-    headerCells.push(<th key="empty" aria-label="empty cell" />);
+    headerCells.push(
+      <th key="empty">
+        <span style={{ width: 0, height: 0, position: 'absolute', overflow: 'hidden', opacity: 0 }}>
+          Week
+        </span>
+      </th>,
+    );
   }
   for (let i = 0; i < WEEK_DAY_COUNT; i += 1) {
     headerCells.push(<th key={i}>{weekDaysLocale[(i + weekFirstDay) % WEEK_DAY_COUNT]}</th>);

tests/__snapshots__/panel.spec.tsx.snap

@@ -3395,9 +3395,13 @@ exports[`Picker.Panel append cell with cellRender in week 1`] = `
         >
           <thead>
             <tr>
-              <th
-                aria-label="empty cell"
-              />
+              <th>
+                <span
+                  style="width: 0px; height: 0px; position: absolute; overflow: hidden; opacity: 0;"
+                >
+                  Week
+                </span>
+              </th>
               <th>
                 Su
               </th>
@@ -6954,9 +6958,13 @@ exports[`Picker.Panel override cell with cellRender in week 1`] = `
         >
           <thead>
             <tr>
-              <th
-                aria-label="empty cell"
-              />
+              <th>
+                <span
+                  style="width: 0px; height: 0px; position: absolute; overflow: hidden; opacity: 0;"
+                >
+                  Week
+                </span>
+              </th>
               <th>
                 Su
               </th>