Frontend API load now times out; client re-fetches in background

Patch Changes

• Fail fast when the Clerk Frontend API (FAPI) is slow or unreachable during load. The client request and the load-recovery token mint are now bounded by a timeout, and the timed-out client request is aborted instead of being left in flight. A cold Clerk.load() renders identity from a freshly minted session token (falling back to the session cookie if the mint fails) in seconds instead of hanging while retries run. After a degraded load, the client is re-fetched in the background without a time limit, so a slow-but-healthy origin recovers full client data (user profile, other sessions) without a reload. Also fixes hooks like useUser() keeping the cookie-derived stub user after full user data arrives. Adds a timeLimit utility to @clerk/shared/utils that optionally aborts an AbortController on timeout. (#9123) by @nikosdouvlis