Reliability and kiosk fixes

A round of fixes covering the auto-update flow, kiosk polish on Windows, the git provider setup, and how stations refresh to the latest CLI.

• Fixed auto-update segfaults and the boot ENOENT race that occasionally crashed stations on first launch after an upgrade
• Fixed the Windows TUI double-registering keystrokes and the desktop shortcut launching the procedure runner instead of the station daemon
• Fixed the GitHub and GitLab provider setup screens losing state on reload, and surfaced underlying provider errors instead of a generic toast
• Refreshed installs to the latest CLI faster: removed the CDN cache on the version endpoint and suppressed spurious "update failed" warnings on subsequent boots