⚡️(frontend) fix roomId RegExp recompilation

The regex was being recreated on every function call, causing
unnecessary performance overhead.

Hoist the RegExp to a module-level constant to reuse the compiled
pattern.

src/frontend/src/features/rooms/utils/isRoomValid.ts

@@ -4,8 +4,10 @@ export const roomIdPattern = '[a-z]{3}-[a-z]{4}-[a-z]{3}'
 export const flexibleRoomIdPattern =
   '(?:[a-zA-Z0-9]{3}-?[a-zA-Z0-9]{4}-?[a-zA-Z0-9]{3})'
 
+const roomRegex = new RegExp(`^${roomIdPattern}$`)
+
 export const isRoomValid = (roomIdOrUrl: string) =>
-  new RegExp(`^${roomIdPattern}$`).test(roomIdOrUrl) ||
+  roomRegex.test(roomIdOrUrl) ||
   new RegExp(`^${window.location.origin}/${roomIdPattern}$`).test(roomIdOrUrl)
 
 export const normalizeRoomId = (roomId: string) => {

src/frontend/src/routes.ts

@@ -11,6 +11,8 @@ import { CreatePopup } from '@/features/sdk/routes/CreatePopup'
 import { CreateMeetingButton } from '@/features/sdk/routes/CreateMeetingButton'
 import { RecordingDownloadRoute } from '@/features/recording'
 
+const roomIdRegex = new RegExp(`^[/](?<roomId>${flexibleRoomIdPattern})$`)
+
 export const routes: Record<
   | 'home'
   | 'room'
@@ -37,7 +39,7 @@ export const routes: Record<
   room: {
     name: 'room',
     to: (roomId: string) => `/${roomId.trim()}`,
-    path: new RegExp(`^[/](?<roomId>${flexibleRoomIdPattern})$`),
+    path: roomIdRegex,
     Component: RoomRoute,
   },
   feedback: {