fix(menu): typeahead in ContextMenu + NavHeadingMenu (re-land #3432)

[cixzhang]

Re-lands the ContextMenu + NavHeadingMenu typeahead wiring from #3432.

Why this exists

#3432 was merged into its stacked base branch (`navi/feat/use-typeahead`) instead of `main`, so its content never reached `main`. This PR reapplies that same change (commit c7cc818) on top of current `main`, which already includes the merged a11y fixes to these components (e.g. the ContextMenu label rename and `useLongPress` work).

Dependency

This wiring depends on the shared `useTypeahead` hook (`packages/core/src/hooks/useTypeahead.ts`), which is not yet in `main` — it lands separately via #3431 (approved, awaiting merge). This PR must merge after #3431.

Verified locally with the hook present (simulating #3431 landed):

• `vitest` ContextMenu + NavMenu — 44 passed (incl. new typeahead test)
• `eslint` changed files — clean
• `tsc` core project — exit 0
• `check-sync` — clean

Without the hook in `main`, `tsc` reports `Cannot find module '../hooks/useTypeahead'` — this resolves once #3431 merges. The hook is intentionally not included here to avoid duplicating #3431.

What it does

ContextMenu and NavMenu heading menus now support first-character typeahead (type a letter to jump to the matching item), via the shared `useTypeahead` hook — matching DropdownMenu. MoreMenu inherits it through DropdownMenu.

Ref #3343.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
astryx	Error		Jul 2, 2026 7:27pm

[cixzhang]

Closing as redundant: the ContextMenu + NavHeadingMenu typeahead wiring (menus-11) is already in main via #3431 (commit c891bf8), which carried the stacked #3432 content when it merged. Rebasing this branch onto main yields zero remaining commits. No action needed.