Add CSS environment variables for safe-area-inset to prevent content
overlap with notch/home indicator on iOS devices.
Changes:
- expert.css: Add safe area support to body, scene container, and
simple-quick-actions (hamburger menu) navigation
- quick-actions.css: Add safe area support to context menu and
follow-mode-indicator
- panels.css: Add safe area support to toast-container
- troubleshoot.css: Add safe area support to spaxel-dismiss-all
The viewport-fit=cover meta tag was already present in index.html.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>