Add a thumbnailScale field (xs/sm/md/lg/xl) to gallery layout settings
that adjusts column counts for Grid, Masonry (columns mode), and Mosaic
layouts. Each scale maps to a column offset applied on top of the
layout's base columns, letting photographers control photo density.
- Add thumbnailScale to GalleryLayoutSettings type
- Apply scale offset in Grid, Masonry, and Mosaic layout components
- Add thumbnail scale dropdown to admin theme customizer
- Conditionally show dropdown only for applicable layouts
- Safelist dynamic grid-cols classes in Tailwind config
- Add i18n keys for EN, DE, PT, RU locales
Co-authored-by: Paul Nothaft <paul@MacStudio-von-Paul.local>
Paul Nothaft
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