Use DNS records instead of authentication results to determine DKIM
presence, enabling a three-state display: passed (green), published but
invalid signature (yellow+red), or no DKIM at all (red).
- Add 'skipped' to authentication result enum in OpenAPI spec
- Fix optional chaining on bimiResult.details check
- Add rbls field to AppConfig interface
- Restrict theme storage to valid 'light'/'dark' values only
- Fix null coalescing for blacklist result data
- Fix survey source to use domain instead of ip
Detect the List-Unsubscribe-Post: List-Unsubscribe=One-Click header
(RFC 8058) and expose it as the 'one-click' unsubscribe method in the
content analysis. When unsubscribe methods are present but one-click is
absent, the summary card now shows a warning nudging senders to adopt it.
