A same-frame composer whose send control is a custom button the extension's
built-in send-button selectors deliberately do not match: no
aria-label of "Send"/"Submit" and no
data-testid="send-button", just an app-specific id and label. It
exercises the per-rule submitSelectors escape hatch for
issue #10415:
a policy that names #custom-send blocks the send here, while a
policy without it leaves this button unguarded (the built-in selectors miss it).
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