fix: room layout fixed viewport + dashboard room delete

- Room: overflow-hidden + contain:strict on video area prevents layout
  from growing beyond viewport when sidebar opens
- Room: absolute positioning for GridLayout/FocusLayout ensures video
  fills all available space
- Dashboard: delete button on room cards (hover-visible, confirm dialog)
- Dashboard: active rooms cannot be deleted (button hidden)

src/app/(dashboard)/dashboard/page.tsx

@@ -36,6 +36,7 @@ export default function DashboardPage() {
   const { data: session, isPending } = useSession();
   const [rooms, setRooms] = useState<Room[]>([]);
   const [loading, setLoading] = useState(true);
+  const [deleting, setDeleting] = useState<string | null>(null);
 
   useEffect(() => {
     if (!isPending && !session) {
@@ -63,6 +64,24 @@ export default function DashboardPage() {
     }
   }, [session]);
 
+  async function handleDelete(e: React.MouseEvent, room: Room) {
+    e.preventDefault(); // prevent Link navigation
+    e.stopPropagation();
+    if (room.status === "ACTIVE") return;
+    if (!confirm(`Удалить комнату "${room.name}"? Это действие необратимо.`)) return;
+    setDeleting(room.id);
+    try {
+      const res = await fetch(`/api/rooms/${room.id}`, { method: "DELETE" });
+      if (res.ok) {
+        setRooms((prev) => prev.filter((r) => r.id !== room.id));
+      }
+    } catch {
+      // silent
+    } finally {
+      setDeleting(null);
+    }
+  }
+
   if (isPending) {
     return (
       <main className="min-h-screen bg-surface-0 flex items-center justify-center">
@@ -157,15 +176,33 @@ export default function DashboardPage() {
               <Link
                 key={room.id}
                 href={`/room/${room.code}`}
-                className="block bg-surface-1 border border-border-subtle rounded-xl p-5 hover:border-border-default transition-colors cursor-pointer group"
+                className="block bg-surface-1 border border-border-subtle rounded-xl p-5 hover:border-border-default transition-colors cursor-pointer group relative"
               >
                 <div className="flex items-start justify-between mb-4">
                   <h2 className="font-semibold text-base truncate pr-3 group-hover:text-white transition-colors">
                     {room.name}
                   </h2>
-                  <div className={`flex items-center gap-1.5 shrink-0 text-xs font-medium ${statusTextColors[room.status]}`}>
-                    <span className={`h-2 w-2 rounded-full ${statusDotColors[room.status]}`} />
-                    {statusLabels[room.status]}
+                  <div className="flex items-center gap-2 shrink-0">
+                    <div className={`flex items-center gap-1.5 text-xs font-medium ${statusTextColors[room.status]}`}>
+                      <span className={`h-2 w-2 rounded-full ${statusDotColors[room.status]}`} />
+                      {statusLabels[room.status]}
+                    </div>
+                    {room.status !== "ACTIVE" && (
+                      <button
+                        onClick={(e) => handleDelete(e, room)}
+                        disabled={deleting === room.id}
+                        className="opacity-0 group-hover:opacity-100 p-1.5 rounded-lg text-text-muted hover:text-danger hover:bg-danger/10 transition-all disabled:opacity-50"
+                        title="Удалить комнату"
+                      >
+                        {deleting === room.id ? (
+                          <div className="w-4 h-4 border-2 border-danger border-t-transparent rounded-full animate-spin" />
+                        ) : (
+                          <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
+                            <path strokeLinecap="round" strokeLinejoin="round" d="m14.74 9-.346 9m-4.788 0L9.26 9m9.968-3.21c.342.052.682.107 1.022.166m-1.022-.165L18.16 19.673a2.25 2.25 0 01-2.244 2.077H8.084a2.25 2.25 0 01-2.244-2.077L4.772 5.79m14.456 0a48.108 48.108 0 00-3.478-.397m-12 .562c.34-.059.68-.114 1.022-.165m0 0a48.11 48.11 0 013.478-.397m7.5 0v-.916c0-1.18-.91-2.164-2.09-2.201a51.964 51.964 0 00-3.32 0c-1.18.037-2.09 1.022-2.09 2.201v.916m7.5 0a48.667 48.667 0 00-7.5 0" />
+                          </svg>
+                        )}
+                      </button>
+                    )}
                   </div>
                 </div>
                 <div className="flex items-center gap-3 text-sm">

src/app/room/[code]/page.tsx

@@ -153,13 +153,14 @@ export default function RoomPage() {
       serverUrl={LIVEKIT_URL}
       token={token}
       connect={true}
-      className="h-screen flex flex-col bg-surface-0"
+      data-lk-theme="default"
+      className="h-screen max-h-screen flex flex-col bg-surface-0 overflow-hidden"
       onDisconnected={() => router.push(isHost ? "/dashboard" : "/")}
     >
       <RoomAudioRenderer />
 
       {/* Top bar — minimal, just room info */}
-      <header className="flex items-center px-4 h-12 bg-surface-1/80 backdrop-blur-sm border-b border-border-subtle shrink-0">
+      <header className="flex items-center px-4 h-12 bg-surface-1/80 backdrop-blur-sm border-b border-border-subtle shrink-0 z-10">
         <h1 className="text-white font-semibold text-sm">{room?.name ?? "Комната"}</h1>
         {room && (
           <span className="text-[11px] text-text-muted font-mono bg-surface-2 px-2 py-0.5 rounded-md border border-border-subtle ml-3">
@@ -168,28 +169,28 @@ export default function RoomPage() {
         )}
       </header>
 
-      {/* Main content area */}
-      <div className="flex flex-1 min-h-0">
+      {/* Main content area — fixed between header and footer */}
+      <div className="flex flex-1 min-h-0 overflow-hidden">
         {/* Video area */}
-        <div className="flex-1 min-w-0 p-2">
+        <div className="flex-1 min-w-0 min-h-0 relative" style={{ contain: "strict" }}>
           <VideoArea />
         </div>
 
         {/* Sidebar */}
         {sidebarOpen && (
-          <aside className="w-80 shrink-0 border-l border-border-default flex flex-col bg-surface-1">
+          <aside className="w-80 shrink-0 border-l border-border-default flex flex-col bg-surface-1 overflow-hidden">
             {isHost && showLobby && room && (
-              <div className="border-b border-border-default">
+              <div className="border-b border-border-default shrink-0">
                 <LobbyManager roomId={room.id} />
               </div>
             )}
             {isHost && showModeration && room && (
-              <div className="border-b border-border-default">
+              <div className="border-b border-border-default shrink-0">
                 <ModerationPanel roomId={room.id} />
               </div>
             )}
             {showChat && room && (
-              <div className="flex-1 min-h-0">
+              <div className="flex-1 min-h-0 overflow-hidden">
                 <ChatPanel
                   roomId={room.id}
                   sessionId={userId ?? "anonymous"}
@@ -202,7 +203,7 @@ export default function RoomPage() {
       </div>
 
       {/* Bottom control bar — Google Meet style */}
-      <footer className="flex items-center justify-between px-4 h-16 bg-surface-1 border-t border-border-default shrink-0">
+      <footer className="flex items-center justify-between px-4 h-16 bg-surface-1 border-t border-border-default shrink-0 z-10">
         {/* Left: room time or empty */}
         <div className="w-48" />
 
@@ -298,7 +299,7 @@ function VideoArea() {
   // If someone is screen sharing, use focus layout
   if (screenShareTracks.length > 0) {
     return (
-      <FocusLayoutContainer className="h-full">
+      <FocusLayoutContainer className="absolute inset-0">
         <CarouselLayout tracks={cameraTracks} className="h-24">
           <ParticipantTile />
         </CarouselLayout>
@@ -308,7 +309,7 @@ function VideoArea() {
   }
 
   return (
-    <GridLayout tracks={cameraTracks} className="h-full">
+    <GridLayout tracks={cameraTracks} className="absolute inset-0">
       <ParticipantTile />
     </GridLayout>
   );