Afterglow (G14) is removed

The user, looking at the lapis showcase: "one of the animations is like a
flashing on the whole pane or something, that is really bad, just remove it".
Every changed cell glowing meant a pane whose whole text changed (a file
opened, a +Search refilled, a terminal's output) lit up at once: replacing a
pane's text took its mean brightness from 38 to 70 and back over 250 ms.
Gone like Ripple and Glitch: the builtin, the setting, its Chrome fx bit,
the GUI's diff state and decor, the test, and the docs, which keep the
user's words.

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