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perf(store): a list over a shallow store diffs the store's backing (#4345)

* perf(store): a list over a shallow store diffs the store's backing

mapArray read every slot of a shallow store through the proxy traps on each
pass, so a one-row write on a 1k-row list spent ~1.3 ms in per-slot reads.
A shallow store's slots are raw records, so the backing the container read
serves is what every slot read would; the list driver now asks the store
engine for it once per pass (hooks.ts shallowView, installed by store.ts).
Optimistic families, chained backings, accessor slots and reads inside a
draft or write scope keep the per-slot path.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWPYGDS9E7Cd5jHUxWx

* perf(store): keep the shallow list view beside $TRACK

map.ts reached store/hooks.ts for the view slot, which pulled that module
into store-free pages and pushed the live server-component pages 46 B over
their recorded minified size. The slot now lives in store/types.ts, which
map.ts already imports, and the write-scope check covers inDraft.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117BoWPYGDS9E7Cd5jHUxWx

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Co-authored-by: Claude <noreply@anthropic.com>

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