bester-ytm v1.0.0

First public release.

Added

• DJ-style transitions between tracks: a dual-deck mpv engine prebuffers the
  next queued track on a silent second deck and blends it in with an
  equal-power crossfade. TUI controls: t toggles cut/crossfade, [ / ]
  adjust the fade length, and the DECK line becomes a live MIX meter while
  two tracks blend.
• Browser-header login as the default (auth login): paste request headers
  from a logged-in music.youtube.com tab — no Google Cloud setup needed.
  The Google OAuth device flow remains available via auth login --oauth.
• Playlist building from prose briefs: describe the playlist in plain words
  and the configured AI provider (Codex CLI, any OpenAI-compatible endpoint,
  Anthropic API, or an offline heuristic) proposes the tracks and names the
  playlist — an explicit "save it as X" in the brief is honored verbatim.
• Finished builds become named local playlists and load into the queue
  without interrupting the playing track.
• Track removal from both local and YouTube playlists, local playlist
  deletion, and YouTube playlist deletion with a confirming second press.
• Audio-reactive visualizers (Mythos, Bars, Wave, Pulse, Scope) driven by
  live mpv loudness, draggable pane splitters with persistent layout, and
  per-track ratings and tags.
• Transition, volume, layout, builder, and AI provider configuration in
  ~/.config/bester-ytm/config.toml; --transition / --fade flags on
  play playlist; a config show command.
• Documentation site (MkDocs Material) deployed to GitHub Pages, MIT
  license, changelog, architecture documentation, and continuous
  integration (lint, type check, 80% coverage gate, release consistency).