fix: keep token expiry in sync when skipping setUser from JWT

When the setUser call is skipped for an already-loaded user,
info.value.exp was never updated with the renewed token's expiry.
This caused useRenewTokenOnFocus to compute a stale expiresIn,
eventually forcing a logout even though the token was still valid.

Now we always update exp from the JWT, even when skipping the
full setUser call.

frontend/src/stores/auth.ts

@@ -300,6 +300,9 @@ export const useAuthStore = defineStore('auth', () => {
 				// where the display name briefly reverts to the username.
 				if (info.value === null || info.value.id !== jwtUser.id) {
 					setUser(jwtUser, false)
+				} else {
+					// Always keep exp in sync so token renewal checks stay accurate
+					info.value.exp = jwtUser.exp
 				}
 			} catch (_) {
 				logout()