- Move colophon (credit/email/source link) from sticky footer into
a dedicated About dialog, opened from a new header button
- Drop ~64px of bottom container padding now that the footer is gone
- Loosen vinyl-stage aspect-ratio (1:1 -> 1:0.85) so the disc no
longer leaves a tall empty band below the sleeve
- Switch tonearm height: 36% to aspect-ratio: 1 to keep proportions
consistent across the new stage ratio
- Add about.* / dialog.close i18n keys for EN and RU
- Add vinyl-variants-mockup.html as next design reference target
