- Replace 3 S/M/L height buttons with one cycling button (like font size)
- Fix closeAllPanels() to include ctx-panel so Context and Settings menus
cannot be open simultaneously
- Fix ctxOpenBtn handler to use the same toggle-via-closeAllPanels pattern
as the settings button
- Align .hdr-dropdown shadow to var(--shadow) instead of hardcoded rgba
- Align #ctx-panel z-index to 200 (match .hdr-dropdown)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>