v0.6.2

Added

• Troubleshooting guide (docs/TROUBLESHOOTING.md)
  covering sign-in hangs and callback-port conflicts, the OAuth 404
  instance/Client-ID mismatch, Native-vs-Web client setup, empty exports, blank
  location names, and keyring issues.

Changed

• Settings validation. An invalid Callback port (0) or a sub-day
  Install window / SLA is now rejected with a clear message instead of
  being silently clamped, so a typo surfaces rather than quietly changing your
  configuration.

Fixed

• More robust API handling. A malformed paginated response from NinjaOne now
  surfaces an error instead of silently returning a truncated result set as if it
  were complete, and previously-swallowed locations-fetch and result-cache
  failures are now logged.