[mehfuzh]

Problem

Switching between Cloud Models pages (/cloud-models/usage ↔ /cloud-models/history) hung or failed.

• useAuth had pathname in its effect's dependencies, so it refetched /users/me on every route change. The Cloud Models layout stays mounted between its pages, so each switch fetched the user again, even though the layout's comment says it shouldn't.
• Each fetch returned a new user object, so every section's loads (keyed on user) ran again. Opening Usage made about 7 API calls instead of 4: /users/me, then chat/status, chat/ledger and models twice.
• If /users/me failed with a server error (as when the API's pooler connections hang), useAuth sent you to /login.

Change (src/app/hooks/useAuth.ts)

• Load the user once when the hook mounts. Pages without a layout remount on navigation, so they behave as before.
• On a server or network error, keep the user saved by the last successful /users/me instead of redirecting to /login. No token or a 401 still signs you out (handled in user.service).

The API side of the hang is smartloop-ai/slp-api#162.

Testing

• npm run typecheck and npm run build pass.
• Not tested in a browser with a signed-in account. Worth checking the Network tab while switching between Usage and Session History: each switch should load only that page's data, with no /users/me.