expo-router error: "A navigator cannot contain multiple 'Screen'
components with the same name (found duplicate screen named 'feed')".
Cause: having both app/(app)/feed.tsx (a file-route) and
app/(app)/feed/ (a folder with _layout.tsx) at the same level makes
expo-router try to register two routes called "feed".
Fix: the folder's _layout.tsx wraps the tab + its sub-routes in a
single Stack, so the tab screen becomes feed/index.tsx — the initial
screen of that Stack. Back navigation from /feed/[id] and
/feed/tag/[tag] now correctly pops to the Feed tab root.
No other route references changed (paths like /(app)/feed,
/(app)/feed/<id>, /(app)/feed/tag/<tag> still resolve identically).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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