Hero variable system, CSS fallbacks, header cleanup, remove mobile overrides
- Hero card fully variable-driven: --hero-card-bg/color/overlay/border-radius/padding/max-width - Alternative hero variant: --hero-alt-card-* for secondary theme - Overlay bg-position and bg-size now customizable via variables - Mobile breakpoint: photo bg hidden, hero full-bleed on small screens - Added fallback values to 1365 var() calls in template.css - .btn --btn-bg changed from transparent to var(--body-bg) in dark/light themes - .offcanvas-header .btn-close gets background-color from overlay - Stripped file info headers (@package/DEFGROUP/VERSION) from 48 files, kept copyright/SPDX - Synced all theme variables across standard and custom templates - Removed 26 mobile.php layout overrides - Added *.py to .gitignore, card-border-radius fallback Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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