Clarify useViewTransitionState docs for bidirectional matching

[createhb21]

Summary

• clarify useViewTransitionState docs to describe bidirectional matching (active when transitioning to or from the given location)
• keep generated API docs aligned by updating the source JSDoc comment in lib.tsx
• add a DOM router test that verifies useViewTransitionState stays active for both currentLocation and nextLocation while a transition is in progress

Testing

• pnpm test packages/react-router/__tests__/dom/data-browser-router-test.tsx -t "keeps useViewTransitionState active for both from/to locations during transitions"
• pnpm exec prettier --check packages/react-router/lib/dom/lib.tsx packages/react-router/__tests__/dom/data-browser-router-test.tsx

Closes #14686.

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