UI: context panel popover, light/dark theme, contrast improvements
- Light/dark mode: full palette via @media + [data-theme] override;
theme toggle button (☾/☀) persists to localStorage; no flash on load
- Dark mode softened: #1a1228 bg (was near-pure black), improved muted
text contrast (#9080a8)
- CSS variables: --shadow, --modal-overlay, --code-bg, --pre-bg,
--success, --success-dim replace all hardcoded rgba/hex values
- Context panel: ⚙ header button opens dropdown (like Sessions);
tier badge shows current tier; closes on outside click
- Removed always-visible context bar; controls now in panel
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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