Chat bubbles were quads drawn straight into an overlay with no widget behind them, so `WorldFrame:GetChildren()` never returned them and bubble-skinning addons such as pfUI's found nothing.
In the reference, a bubble is an anonymous Frame under WorldFrame from a reused pool: eleven regions (the nine backdrop pieces, the tail, the text in the `NAMEPLATE_FONT` global), the text's bottom on the speaker's projected point, its own fade, and an OnShow on each reuse. It fades out and hides when the speaker is out of range or was not drawn last frame.
Bubbles are now built that way, fed by the app and drawn by the frame pass; the overlay path is gone. Item links show their bare names, and a speaker behind the camera fades out.
Tests cover the child, its regions, a pfUI-style skin, reuse and the fades.
Fixes#884
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
