Without a root app/index.tsx in the repo, a stale default Expo Router
scaffold file (showing "Hello World") could be picked up from a previous
build or CLI scaffolding and displayed instead of the real app.
The new index.tsx immediately redirects to /(auth)/, and the existing
AuthGuard in _layout.tsx forwards authenticated users to /(tabs)/.
Also registers the index screen in the root Stack and updates
docs/MobileApp.md with an expanded project structure and a new
troubleshooting entry.
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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