Applied unchanged after review (Grok static review: MERGE; the diff read in full: no network, no new dependency, no
shipped eval). The leak was real on feedback7: mountFieldView raced createFieldView against a timeout and, on failure,
removed every child of the host while the factory kept running — Pixi finished later and appended its canvas over the
simplified view (taking its clicks); the host wipe could also delete a newer view mounted by the same hook.
- ui/fieldHost.js: mountFieldView(host, { signal }) owns an AbortController; the timeout, a failed import or an invalid
view aborts it, a view a factory returns after that is destroyed, an outer abort (useFieldView's cleanup) rejects
without a fallback; nothing clears the host's children any more.
- render/app.js createFieldView takes the signal: the Pixi load / manifest / font waits end on abort, the synchronous
build registers its disposables (setupCleanup) so a throw releases the app, tiles, fx, impostors, listeners and
observers it made, the board-art and 3D-board waits moved after the view exists (aborting them is view.destroy(),
idempotent), destroy() also removes the canvas. render/app/host.js withTimeout(p, ms, signal).
- Tests: test/ui/fieldHost-lifecycle.test.js (5, node vm, fake timers: all fail on the parent) and the opt-in real-browser
test/render/initialization.browser.test.js (6 scenarios in headless Chrome, 5 fail on the parent: a late Pixi load
covering the fallback — with a factory that honours the signal and one that ignores it —, art timeout, a setup
exception, an unmount racing a newer mount); test/ui/playtest2.test.js's source pin takes the new indentation.
fieldview / browser suites in Chrome unchanged (the two 4× throttled fps tests flake when two Chrome files run
at once, pass alone).
- The createFieldView body stays unindented inside its new try (the PR's choice, to keep the diff reviewable).
- Docs: design/client.md §9. Golden: unchanged (client lifecycle only).
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