Videos play by themselves, muted, while on screen — with an Unmute button; YouTube too.

An inline video starts as it scrolls into view (muted, the only way a
browser lets a page start one), pauses as it leaves, and a corner button
turns the sound on; the native controls' own mute keeps the button honest.
A YouTube box loads its player muted once in view (enablejsapi, so the
same button can unmute it over the iframe API) and pauses out of view; a
tap on the poster still means sound. One IntersectionObserver watches
every player. Data Saver keeps tap-to-play.

Tests adapted to the feed's new admission rule (a row waits for its
author's face and pictures): the markdown and post-actions tests seed the
poster's profile and serve their pictures locally; a picture that cannot
be decoded is now a link, by design.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

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