feat(ui): tabulate voice and chat panels to prevent overlapping

web/src/components/Layout.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useState } from 'react';
 import { Link, Outlet, useLocation, useNavigate } from 'react-router-dom';
+import { useVoiceStore } from '../stores/voice.ts';
 import { useAuthStore, type UserStatus } from '../stores/auth.ts';
 import { useWebSocketStore } from '../stores/ws.ts';
 import { useServerStore } from '../stores/server.ts';
@@ -44,6 +45,17 @@ export function Layout() {
   const setMobileView = useLayoutStore((s) => s.setMobileView);
   const [showServerSettings, setShowServerSettings] = useState(false);
   const activeServerId = useServerStore((s) => s.activeServerId);
+  const currentVoiceRoom = useVoiceStore((s) => s.currentRoom);
+  const [activeTab, setActiveTab] = useState<'chat' | 'voice'>('chat');
+
+  useEffect(() => {
+    if (currentVoiceRoom) {
+      setActiveTab('voice');
+    } else {
+      setActiveTab('chat');
+    }
+  }, [currentVoiceRoom]);
+
   useEffect(() => {
     wsConnect();
     return () => { wsDisconnect(); };
@@ -187,10 +199,30 @@ export function Layout() {
             `}
           >
             <div className="flex-1 min-h-0 flex flex-col overflow-hidden">
-              <VoicePanel />
-              <div className="flex-1 min-h-0">
+              {currentVoiceRoom && (
+                <div className="flex bg-gb-bg-s border-b border-gb-bg-t">
+                  <button
+                    className={`flex-1 py-2 text-xs text-center border-b-2 ${activeTab === 'chat' ? 'border-gb-fg-f text-gb-fg-f' : 'border-transparent text-gb-fg-s hover:text-gb-fg-f'}`}
+                    onClick={() => setActiveTab('chat')}
+                  >
+                    [CHAT]
+                  </button>
+                  <button
+                    className={`flex-1 py-2 text-xs text-center border-b-2 ${activeTab === 'voice' ? 'border-gb-fg-f text-gb-fg-f' : 'border-transparent text-gb-fg-s hover:text-gb-fg-f'}`}
+                    onClick={() => setActiveTab('voice')}
+                  >
+                    [VOICE/VIDEO]
+                  </button>
+                </div>
+              )}
+              <div className={`flex-1 min-h-0 flex-col ${activeTab === 'chat' || !currentVoiceRoom ? 'flex' : 'hidden'}`}>
                 <Outlet />
               </div>
+              {currentVoiceRoom && (
+                <div className={`flex-1 min-h-0 flex-col overflow-y-auto bg-gb-bg ${activeTab === 'voice' ? 'flex' : 'hidden'}`}>
+                  <VoicePanel />
+                </div>
+              )}
             </div>
           </div>