- Added comprehensive tests for default settings, storage parsing, and error handling.
- Covered `setLinkPreviewAutoFetch` and `allowLinkPreviewDomain` (including normalization and silent mode).
- Verified `isLinkPreviewDomainAllowed` and event subscriptions.
- Mocked `window.dispatchEvent`, `addEventListener`, and `CustomEvent` locally as they are missing from test helpers.
Co-authored-by: PR0M3TH3AN <[email protected]>