full update

src/lib/chat/deleteWindow.ts

@@ -0,0 +1,20 @@
+export const DELETE_WINDOW_MS = 24 * 60 * 60 * 1000;
+
+export function parseMessageCreatedAt(
+  createdAt?: string | null,
+  createdAtIso?: string | null
+): Date | null {
+  const raw = createdAtIso || createdAt;
+  if (!raw) return null;
+  const d = new Date(String(raw));
+  return Number.isNaN(d.getTime()) ? null : d;
+}
+
+export function isMessageDeletable(
+  createdAt?: string | null,
+  createdAtIso?: string | null
+): boolean {
+  const created = parseMessageCreatedAt(createdAt, createdAtIso);
+  if (!created) return false;
+  return Date.now() - created.getTime() <= DELETE_WINDOW_MS;
+}

src/lib/chat/socketClient.ts

@@ -28,10 +28,13 @@ export function getChatSocket(): Socket | null {
 
 export function releaseChatSocket(): void {
   refCount = Math.max(0, refCount - 1);
-  if (refCount === 0 && sharedSocket) {
-    sharedSocket.removeAllListeners();
+}
+
+export function disconnectChatSocket(): void {
+  if (sharedSocket) {
     sharedSocket.disconnect();
     sharedSocket = null;
+    refCount = 0;
   }
 }