feat: add the candy-night scheme

A tenth scheme, sampled from a desktop shot built on the Candy icon set
(https://github.com/EliverLara/candy-icons) over a near-black purple ground.
Its hue ramp is deliberately that icon set's folder gradients, so the palette
names the same colours the icons are drawn in.

The colours are measured from solid regions of the source image rather than
taken from a published scheme, which is why the palette names are this file's
own. The window body in that image is translucent over the wallpaper and so
contributes no value; that is opacity, not a colour.

One split is load-bearing: [ui] accent is the true magenta #cc0dbf from the
image, while [terminal] magenta is #f00fe0, the same hue lifted to lightness
0.50. Against the scheme's background the original scores 3.79 contrast, under
the 4.5 wanted for body text. The accent only ever fills large areas, where it
reads fine; terminal magenta is glyphs on a dark ground, where it does not.
Every other terminal colour already clears 4.5 (lowest: red at 5.42); ANSI
black stays low as it does in every other scheme, since it is never body text.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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