feat: 在顶栏并排展示下发智能体并直接切换

src/pages/Chat/classroom-workspace.css

@@ -69,7 +69,9 @@
 
 /* The teacher speaks from the title bar without taking the student's focus. */
 .classroom-composer-view[hidden] { display: none; }
-.teacher-companion { position: relative; flex-shrink: 0; }
+.teacher-companion { position: relative; min-width: 0; max-width: 65%; }
+.consultation-agent-tabs { display: flex; align-items: center; gap: 4px; max-width: 100%; overflow-x: auto; scrollbar-width: thin; }
+.consultation-agent-tabs .teacher-companion-person { flex-shrink: 0; }
 .teacher-companion-person { display: flex; align-items: center; gap: 6px; height: 36px; padding: 0 8px; border-radius: 8px; color: #747d6c; transition: background 150ms; }
 .teacher-companion-person:hover, .teacher-companion-person[aria-expanded="true"] { background: #eef1e8; color: #42543a; }
 .teacher-companion-avatar { position: relative; flex-shrink: 0; }