fix: source list scroll, citation targeting, and page UI polish

- Replace ScrollArea with native overflow-y-auto for reliable mouse wheel scrolling
- Scope source DOM IDs by message ID to fix cross-round citation jumps
- Improve profile, settings, forum, knowledge page layouts
- Update mobile navigation and chat interface

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/src/app/(main)/admin/users/page.tsx

@@ -154,7 +154,7 @@ export default function UsersPage() {
                       <div className="flex items-center justify-center gap-1">
                         <button
                           onClick={() => handleDelete(u.id)}
-                          className="text-xs px-2 py-1 bg-red-600 text-white rounded hover:bg-red-700"
+                          className="text-xs px-2 py-1 bg-destructive text-destructive-foreground rounded hover:bg-destructive/80"
                         >
                           确认
                         </button>