muscli v0.2.0-beta.2

• Added an optional native audio backend with ReplayGain, an eight-band
  equalizer, a limiter, high-quality resampling, dither, bit-perfect mode, and
  gapless playback between tracks with matching stream formats.
• Added automatic fallback to mpv for formats the native decoder cannot read.
• Added seek controls, a decibel volume scale, audio-device selection, and
  native-backend diagnostics in muscli doctor.
• Added artist and genre group enqueueing, and made shuffle update the
  unplayed part of an active queue without skipping the current track.
• Discord Rich Presence now uses muscli's built-in application ID; users no
  longer need to create or configure their own Discord application.
• Added a selectable colour theme on Linux and Windows alike: light (the new
  default, on a white background), dark, high-contrast, nord, gruvbox,
  solarized-light, and system to follow the Omarchy palette on Linux. It is
  chosen from the settings view, theme in config.toml, or --theme for a
  single run. Linux installs that were following the Omarchy palette get the
  light default and restore the old behaviour with theme = "system".
• Added the interface language to the settings view; changing it applies
  immediately, without restarting.
• Added the settings previously reachable only by editing config.toml: gapless
  playback, scan threads, and every band of the equaliser, with a row to flatten
  it again.
• Reworked cover rendering and cache versioning to avoid stale artwork and
  unnecessary terminal redraws.
• Fixed saved volume resets, playback between different sample rates, context
  menu redraws, terminal restoration after hangup, and queue edge cases.