feat: optimize mobile responsive layout for share page

- Add responsive design for mobile devices (≤768px)
- Switch from horizontal to vertical layout on mobile
- Hide middle divider panel on mobile
- Optimize button sizes for mobile touch interaction
- Improve input field and button alignment on mobile

frontend/src/page/share/component/panel-mid.tsx

@@ -5,6 +5,10 @@ const useStyle = createUseStyles({
         backgroundColor: 'lightgray',
         position: "relative",
         overflow: "hidden",
+
+        "@media (max-width: 768px)": {
+            display: "none",
+        },
     },
     left: {
         backgroundColor: "#e3f2fd",