Add experiment flag for Customizable Navigation Overlays #73356
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What
This PR adds a new Gutenberg experiment flag "Customizable Navigation Overlays" as the first step in implementing customizable navigation overlays (issue #73084). The experiment can be enabled from the Gutenberg experiments settings page and sets a JavaScript flag (
window.__experimentalNavigationOverlays) that will be used by subsequent PRs to conditionally enable overlay customization features.Why
This experiment flag provides a safe way to develop the customizable navigation overlays feature without disrupting current Navigation block behavior. By gating the feature behind an experiment, we can iterate on the implementation while keeping the existing functionality stable for all users.
How
The implementation follows the standard Gutenberg experiment pattern:
Testing Instructions
window.__experimentalNavigationOverlaysis set totrue