feat(install): install the generated GTK theme as ~/.themes/udt

One fixed name for every scheme, like Kvantum: the name is referenced by
gsettings and by the GTK4 symlink, so a per-scheme name would mean rewriting
both on every switch and leaving stale themes behind.

Only the two GTK directories are installed. The upstream theme this derives
from also ships cinnamon, gnome-shell, metacity, xfwm4 and plank directories,
none of which anything here reads.

gtk-dark.css is written alongside gtk.css because apps request one or the
other depending on the prefer-dark setting; upstream ships them identical.

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

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