Card: defer element registration until HA app boots (HA 2026.8 registry race) - #9
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…registry race)
HA 2026.8's frontend bundles the scoped-custom-element-registry polyfill,
which replaces window.customElements with a fresh registry at app.js
start. The card is loaded via extra_module_url, imported by the index
page concurrently with app.js; with a warm cache it reliably defines on
the native registry before the swap and customElements.get() then returns
undefined -> "Custom element doesn't exist: shade-engine-card" on every
dashboard (browsers and companion apps alike).
Wait for customElements.whenDefined('home-assistant') and define on
whatever registry is current at that point. Verified 10/10 registrations
in headless Chromium against the live server (was ~1 in 6 failing cold,
and consistently failing with a cached module). Bump to 0.5.1 so the
?v= cache-buster refreshes clients.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Fixes "Custom element doesn't exist: shade-engine-card" on every dashboard after the HA 2026.8 update. See commit message for root cause; verified 10/10 in headless Chromium against the live server and already deployed there.
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