Improve relay settings UI and add nos.lol to app relays

- Redesigned RelayListManager with cleaner, simpler layout
- Added nos.lol to the default app relays list
- App relays now show with simple toggle switch
- User relays section with empty state when no relays configured

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

src/lib/appRelays.ts

@@ -9,6 +9,7 @@ export const APP_RELAYS: RelayMetadata = {
     { url: 'wss://relay.ditto.pub', read: true, write: true },
     { url: 'wss://relay.primal.net', read: true, write: true },
     { url: 'wss://relay.damus.io', read: true, write: true },
+    { url: 'wss://nos.lol', read: true, write: true },
   ],
   updatedAt: 0,
 };