Fetch the Nitro client iframe with high priority so the browser starts the
game document before competing resources, and replace the bare /client
spinner with a branded boot screen. Preconnect and eager loading were already
in place; typing support for the iframe fetchPriority prop is added in a
React type augmentation.
Rework the register terms block into a single clickable accept control with
a custom check state, error shake and inline hint, and dim the submit button
until the terms are accepted. The register page gets labeled sections
(account details / credentials), a corrected banner overlay, translated
show/hide toggles and a captcha slot that reserves height to avoid layout
shifts. English is the source of truth; other locales fall back to it.
openhands