Add a Preview Rate dropdown control that allows users to adjust the
playback speed of thumbnail hover preview videos on the events page.
- Add previewRateHtml() helper method to Filter class
- Add Preview Rate to simple_widget() filter bar with matching term styling
- Add getPreviewRate() and changePreviewRate() JS functions in skin.js
- Add helper functions in _monitor_filters.php for rate options
- Store selected rate in zmPreviewRate cookie (values: 100-1600 for 1x-16x)
- Add PreviewRate translation to en_gb.php
- Add CSS styling for preview rate control
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>