feat: notifikasi real-time bug baru via WebSocket

- presence.ts: tambah notifSubs (ADMIN+DEVELOPER) dan broadcastNotification
- app.ts: broadcast new_bug event setelah bug dibuat, update WS handler
- usePresence: terima callback onNewBug, expose NewBugPayload type
- DashboardLayout: pasang usePresence, tampilkan Mantine notification saat bug baru masuk

src/lib/presence.ts

@@ -2,6 +2,7 @@ import type { ServerWebSocket } from 'bun'
 
 const connections = new Map<string, Set<ServerWebSocket<{ userId: string }>>>()
 const adminSubs = new Set<ServerWebSocket<{ userId: string }>>()
+const notifSubs = new Set<ServerWebSocket<{ userId: string }>>()
 
 export function getOnlineUserIds(): string[] {
   return Array.from(connections.keys())
@@ -13,7 +14,12 @@ function broadcast() {
   for (const ws of adminSubs) ws.send(msg)
 }
 
-export function addConnection(ws: ServerWebSocket<{ userId: string }>, userId: string, isAdmin: boolean) {
+export function addConnection(
+  ws: ServerWebSocket<{ userId: string }>,
+  userId: string,
+  isAdmin: boolean,
+  canReceiveNotifs: boolean,
+) {
   let set = connections.get(userId)
   if (!set) {
     set = new Set()
@@ -24,6 +30,7 @@ export function addConnection(ws: ServerWebSocket<{ userId: string }>, userId: s
     adminSubs.add(ws)
     ws.send(JSON.stringify({ type: 'presence', online: getOnlineUserIds() }))
   }
+  if (canReceiveNotifs) notifSubs.add(ws)
   broadcast()
 }
 
@@ -32,6 +39,11 @@ export function broadcastToAdmins(message: object) {
   for (const ws of adminSubs) ws.send(msg)
 }
 
+export function broadcastNotification(message: object) {
+  const msg = JSON.stringify(message)
+  for (const ws of notifSubs) ws.send(msg)
+}
+
 export function removeConnection(ws: ServerWebSocket<{ userId: string }>) {
   const userId = ws.data.userId
   const set = connections.get(userId)
@@ -40,5 +52,6 @@ export function removeConnection(ws: ServerWebSocket<{ userId: string }>) {
     if (set.size === 0) connections.delete(userId)
   }
   adminSubs.delete(ws)
+  notifSubs.delete(ws)
   broadcast()
 }