Pre-send checklist before launching a broadcast

Add a checklist that runs before a broadcast or sequence goes live and blocks sending on failures.

Subject length and preview text present.
Unsubscribe link present.
Postal address present.
HTML size under the Gmail clipping limit (about 100 KB).
Sending domain verified at the ESP.
A test send was made.
Optional: send to the most engaged contacts first, as a cheap first step toward Warmup scheduler #5.

Blocking: subject, content, unsubscribe link present, postal address, domain verified, sending enabled, size under about 100 KB.
Warnings only: subject over 70 characters, missing preview text, no test sent.
Measure the size on the fully rendered email with tracking pixel and link wrapping applied, because that's what Gmail clips.
"A test send was made" depends on Send a test of a broadcast or sequence email to yourself #34 (test send of a campaign email).
The editor preview could show the inbox row (sender, subject, preview text), a desktop/mobile toggle and a live KB counter.

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