feat: theme Firefox from the accent via pywalfox

udt-accent now rewrites ~/.cache/wal/colors.json as a fixed Catppuccin
Macchiato palette with the wallpaper's accent in the cursor and the two
highlight slots, then runs `pywalfox update`.

colors.json is the only file pywalfox reads, so this is the only way Firefox
can follow the accent. Overwriting it wholesale costs nothing: wallp already
rewrote it moments earlier via `wal --theme`, and nothing else consumes it.
kitty reads its own current-theme.conf, so the terminal palette is unaffected.

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

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