fix: 日期格式化为yyyy-MM-dd、出勤说明另起一行

- 本周还车/交车/替换的日期从ISO格式截取前10位
- 出勤说明移到切换按钮下方单独一行

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/App.tsx

@@ -1456,8 +1456,6 @@ export default function App() {
                 </button>
               </div>
 
-              <span className="text-[10px] text-gray-400 font-medium">*说明：当天里程&gt;0即为出勤。</span>
-
               <div className="flex-1 max-w-[240px]">
                 {deptViewMode === 'manager' && (
                   <div className="relative">
@@ -1479,6 +1477,9 @@ export default function App() {
                 )}
               </div>
             </div>
+            <div className="px-2 mb-2">
+              <span className="text-[10px] text-gray-400 font-medium">*说明：当天里程&gt;0即为出勤。</span>
+            </div>
 
             {/* Desktop Table View */}
             <div className="hidden lg:block overflow-x-auto">
@@ -2657,7 +2658,7 @@ export default function App() {
                             <tr key={`${v.truck_id}-${i}`} className={`border-b border-gray-100 hover:bg-blue-50/50 transition-colors ${i % 2 === 0 ? 'bg-white' : 'bg-gray-50/30'}`}>
                               <td className="p-2 border-r border-gray-100 font-mono font-bold text-blue-700 text-center">{v.plate_number}</td>
                               <td className="p-2 border-r border-gray-100 text-gray-600 text-center">{v.customer_name || '—'}</td>
-                              <td className="p-2 text-gray-500 text-center">{v.handover_date || '—'}</td>
+                              <td className="p-2 text-gray-500 text-center">{v.handover_date ? v.handover_date.slice(0, 10) : '—'}</td>
                             </tr>
                           ))}
                         </tbody>