keep original presentation name

src/pages/RoomDetail.jsx

@@ -184,7 +184,10 @@ export default function RoomDetail() {
     try {
       const arrayBuffer = await file.arrayBuffer();
       const res = await api.post(`/rooms/${uid}/presentation`, arrayBuffer, {
-        headers: { 'Content-Type': file.type },
+        headers: {
+          'Content-Type': file.type,
+          'X-Filename': encodeURIComponent(file.name),
+        },
       });
       setRoom(res.data.room);
       setEditRoom(res.data.room);
@@ -607,7 +610,7 @@ export default function RoomDetail() {
                   <div className="min-w-0">
                     <p className="text-xs text-th-text-s">{t('room.presentationCurrent')}</p>
                     <p className="text-sm text-th-text font-medium truncate">
-                      presentation.{room.presentation_file.split('.').pop()}
+                      {room.presentation_name || `presentation.${room.presentation_file?.split('.').pop()}`}
                     </p>
                   </div>
                 </div>