Oxide v0.5.4

Added

• 17 new theme presets from Omarchy:
  ethereal, everforest, flexoki-light, hackerman, kanagawa,
  last-horizon, lumon, lupine, matte-black, miasma, osaka-jade,
  retro-82, ristretto, rose-pine-dawn, solitude, vantablack, and
  white. That makes 25, four of them light. The theme picker (cmd-alt-t)
  now scrolls to fit them all.