fix(accent): make udt-accent scheme-independent

Two things still assumed Catppuccin. The QML header hardcoded "Catppuccin
Macchiato" regardless of the scheme in use, and the selftest asserted that an
orange input snaps to a colour named "peach", which is true only under
Catppuccin: Tokyo Night calls that hue "orange" and the test failed the moment
the scheme changed.

The header now names the scheme it generated from. The snapping assertions
test the property instead of the spelling: an input must land within 0.6 rad
of its own hue, and a border neighbour must sit nearer the accent than its
opposite. Both hold under any palette.

Verified: --selftest passes under macchiato, tokyo-night, nord and dracula.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015gbjA2bmswN8jyPDKzrvqe

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