v1.5.6
Fix maintenance mode admin notice and strict enabled-state handling.
Changes:
- Fixed admin warning notice so it only appears when maintenance mode is actually enabled.
- Added strict checkbox sanitization to prevent stale truthy values from keeping maintenance mode active.
- Purges common WordPress, host, and page-cache plugins immediately whenever maintenance mode is toggled on or off.
- Adds early maintenance checks on init and template_redirect so logged-out visitors are intercepted before the theme loads.
- Adds cache-bypass constants and diagnostic maintenance response headers.
- Adds hidden checkbox fallback so disabling maintenance mode saves reliably.