Same shell pattern as top-buh/top-finance/thbd-portal: desktop top nav
stays >=lg, a fixed bottom tab bar takes over below it. Only 2 nav
links here so both fit directly, no overflow menu needed.
Also adds manifest.webmanifest + 192/512 icons (rendered from the
existing icon.svg) and appleWebApp/viewport metadata so the app can be
installed to a phone's home screen.
Nudged ticket-toasts.tsx's fixed bottom offset so it clears the new
bottom nav bar on mobile instead of overlapping it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gh2UXUQUVBWroWEnn1FLFG
