Editing store: drop dead previouslyEditedElement / tabDirection state (#334 follow-up)

[CarlosNZ]

Stacked on #352. Merge that one first.

Follow-up cleanup queued from #352's plan. After the redirect useLayoutEffect retirement landed, previouslyEditedElement and tabDirection became write-only state — the only writers (recordPreviousEdit, setTabDirection) had no remaining readers anywhere in src/ or test/. Audit:

grep -rn 'previouslyEditedElement|recordPreviousEdit' src test
  → only declarations + the writer call in ValueNodeWrapper.tabTo

grep -rn 'tabDirection|setTabDirection' src test
  → only declarations + the writer call in ValueNodeWrapper.tabTo

Changes

• EditingStateBundle loses previouslyEditedElement: CollectionKey[] | null and tabDirection: TabDirection.
• EditingStore loses recordPreviousEdit and setTabDirection. Shape is now { subscribe, getSnapshot, getServerSnapshot, open, cancel, submit, areChildrenBeingEdited }.
• ValueNodeWrapper.tabTo drops the two store calls. The viability-aware getNextOrPreviousAtPath (from Tab viability: skip non-viable targets, retire redirect useLayoutEffect (#334) #352) already skips non-viable Tab targets up front, which is the role those store fields used to support.
• Unused TabDirection import removed from EditingProvider.
• useEditing public hook's return shape shrinks correspondingly (the two action methods are no longer exposed).

Test plan

• pnpm test — 456 tests across 18 suites passing (same as Tab viability: skip non-viable targets, retire redirect useLayoutEffect (#334) #352, no test references to the removed fields).
• pnpm lint && pnpm compile && pnpm build — clean.

Diff stat

File	Delta
src/contexts/EditingProvider.tsx	−22
src/ValueNodeWrapper.tsx	−15
.changeset/*.md	+3

🤖 Generated with Claude Code

[github-actions]

Bundle size impact

json-edit-react

Format	Base raw	PR raw	Δ raw	Base gzip	PR gzip	Δ gzip
esm	56.03 KB	55.76 KB	🟢 -280 B (-0.49%)	20.10 KB	20.01 KB	🟢 -89 B (-0.43%)
cjs	57.56 KB	57.29 KB	🟢 -281 B (-0.48%)	20.19 KB	20.10 KB	🟢 -91 B (-0.44%)

_{Measured from build/index.{cjs,esm}.js. Gzip at level 9.}