Add theme-aware severity/neon CSS variables and replace hardcoded hex
colors (#fff, #000, #00ff88, #ffcc00, etc.) with var() references
across 26 files so text remains readable in both dark and light themes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Nav active labels used color: var(--bg-primary) which resolved to
near-white on light backgrounds. Run-state chips and buttons had
hardcoded dark RGBA backgrounds. Added light-theme overrides for
readable text and appropriate light backgrounds.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>