Implement frontend session routing flow

- Validate and prepare access links in apps/frontend
- Add session, ended, and unauthorized routes with polling
- Copy full public access URLs from the admin links page

apps/frontend/package.json

@@ -4,7 +4,7 @@
     "version": "0.0.1",
     "type": "module",
     "scripts": {
-        "dev": "vite dev --port 5173",
+        "dev": "vite dev --port 5174",
         "build": "NODE_ENV=build vite build",
         "prod": "HOST=0.0.0.0 PORT=3000 node ./build/index.js",
         "preview": "vite preview",