When a remote gateway with username/password (or OAuth) auth restarts, its
session cookie lapses and Desktop boots into the recovery overlay with a
session-expired error. That overlay only exposed local-recovery actions —
Retry (resets the local bootstrap latch) and Repair (re-runs the installer) —
neither of which can re-establish a remote session, so the user is stuck in a
no-op Retry loop with no way to sign in again.
The overlay now detects a remote-reauth boot failure from the saved connection
config (remote + gated + not currently connected + has a URL) and surfaces a
primary 'Sign in to remote gateway' button that opens the gateway login window
(the username/password form for a basic gateway, the OAuth redirect otherwise)
and reloads on success. Button copy is driven by a best-effort provider probe,
matching the gateway-settings page. Detection and copy logic live in a pure
helper module with unit coverage.
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