Ensure shortcut component and shui shortcut badges work across both
Radix and legacy Logseq color themes by adding proper fallback chains:
- shortcut.css: Add --lx-* → --rx-* fallbacks for gray scale (08-12),
--lx-* → --ls-* → --rx-* for background steps (01-04, 06), use
opacity-based row dimming instead of color-based for theme-agnostic
muting, and use --color-level-6 for icon link color
- shui.css: Add --rx-* fallbacks to bare --lx-* variables on shortcut
key badges (background, border, text color, separator)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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