Offline page redesign, remove brand showcase tab, force a11y/theme to bottom-right
- Offline page: full-viewport Joomla offline_image background, centered glass card
overlay with logo glow, message, offline position, login accordion, copyright
- Favicon: added to offline page, HTML-escaped paths in helper
- Removed brand showcase tab, added footer CSS vars to CSS Variables tab
- Forced a11y toolbar and theme FAB to bottom-right (removed position selectors)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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