feat(accent): play the border gradient on a Tuya LED strip

udt-ledstrip sends the window border's three hues to every Tuya
addressable strip in the tinytuya device list as a flow scene (DP 51,
dreamlight_scene_mode), so the strip moves with the wallpaper accent.

Fully local: it speaks protocol 3.5 itself with cryptography, finds the
strip by its UDP discovery broadcast, and reads the local key from
~/.config/udt/tuya/devices.json, written once by tinytuya's wizard.
DP 51's layout is undocumented and missing from the cloud spec; it was
read off the strip's status pushes while the app set scenes. Saturation
is floored at full because LEDs render pastel accents as white.

udt-accent starts it detached next to udt-keyboard; install.sh links it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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