Fix mobile overlay safe areas

[olegberman]

Summary

• keep compact right-side sheet headers and close controls below the top safe area
• apply the same top-safe layout to full-screen new-message, reply, and forward composers
• add device-aware bottom spacing to new-message send, attachment, and discard actions
• publish the candidate as HQBase 0.1.30

Root cause

The shared right sheet and full-screen composer surfaces were positioned against the physical
viewport edge. Unlike the application shell and navigation drawer, they did not reserve the iOS
safe-area insets, so the notch, Dynamic Island, or home indicator could cover important controls.

Impact

Mobile users can reliably dismiss right drawers and composers, and the new-message action row keeps
comfortable spacing above the bottom device inset. Desktop layout remains unchanged.

Validation

• WRANGLER_LOG_PATH=/tmp/hqbase-mobile-safe-area-release-check.log CI=true pnpm check
• WRANGLER_LOG_PATH=/tmp/hqbase-mobile-safe-area-release-dry-run.log CI=true pnpm deploy:dry-run
• git diff --check