Topbar (avatar, network indicator) was hidden behind iOS status bar
in standalone PWA mode. Added safe-area-inset-top padding to topbar.
Disabled user-scalable to prevent accidental zoom.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Body fixed to 100dvh with overflow:hidden. SOS button capped at
min(60vmin, 70vw, 300px) to fit within viewport alongside topbar.
Bump SW cache to v3.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
