fix: improve week header cell styling

Author: aojunhao123

src/PickerPanel/DatePanel/index.tsx

@@ -99,10 +99,8 @@ export default function DatePanel<DateType extends object = any>(props: DatePane
 
   if (prefixColumn) {
     headerCells.push(
-      <th key="empty">
-        <span style={{ width: 0, height: 0, position: 'absolute', overflow: 'hidden', opacity: 0 }}>
-          {locale.week}
-        </span>
+      <th key="empty" style={{ pointerEvents: 'none', opacity: 0 }}>
+        {locale.week}
       </th>,
     );
   }

tests/__snapshots__/panel.spec.tsx.snap

@@ -3395,12 +3395,10 @@ exports[`Picker.Panel append cell with cellRender in week 1`] = `
         >
           <thead>
             <tr>
-              <th>
-                <span
-                  style="width: 0px; height: 0px; position: absolute; overflow: hidden; opacity: 0;"
-                >
-                  Week
-                </span>
+              <th
+                style="pointer-events: none; opacity: 0;"
+              >
+                Week
               </th>
               <th>
                 Su
@@ -6958,12 +6956,10 @@ exports[`Picker.Panel override cell with cellRender in week 1`] = `
         >
           <thead>
             <tr>
-              <th>
-                <span
-                  style="width: 0px; height: 0px; position: absolute; overflow: hidden; opacity: 0;"
-                >
-                  Week
-                </span>
+              <th
+                style="pointer-events: none; opacity: 0;"
+              >
+                Week
               </th>
               <th>
                 Su