feat(accent): generate a QML palette for quickshell

udt-accent now writes ~/.cache/wal/udt-palette.qml alongside the accent,
border and colors.json it already produced. Quickshell components read it
and watch it, so editing the palette here recolours a running shell
without restarting it.

Unlike the other outputs this one is not only the accent: it carries the
structural colours too. Those are parsed out of rofi/udt/palette.rasi
rather than restated in the script, so that file stays the single place
the Macchiato values are written down. Hardcoding them a second time
here is exactly the drift this is meant to remove: the quickshell
components each had their own copy before this.

The atomic write that write_border already did by hand is now a helper,
write_atomic, used by both. Every generated file is watched by something,
and a torn read shows up as a theme that briefly loses its colours.

colors.json is untouched by this change, verified by running the script
before and after and comparing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G7NRsGyF9jGfPYS4zPqpN7

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