Singing Stream Savior 2.0.3.0

Singing Stream Savior 2.0.3.0 adds unaccompanied performances and improves
lyrics discovery, Japanese and Korean reading aids, and OBS setup.

• Added unaccompanied performance items for a cappella, self-accompanied, and
  other performances without a media file. They can be ended manually or after
  an optional planned duration, and work with the queue, Now Singing, history,
  and project saving.
• Automatic lyrics lookup now combines LRCLIB results with YouTube subtitles
  instead of hiding one source, with improved language-aware ordering and
  clearer handling of subtitle download limits.
• Improved Korean subtitle identification and added Korean romanization with
  readable word spacing.
• Improved context-sensitive Japanese readings and unified the main preview,
  detached lyrics window, and OBS output around one preloaded background
  reading service with sentence caching and recovery states.
• Clicking Drag to OBS now copies the local Browser Source path, while holding
  and dragging the same button continues to create the source directly.
• Added full-name tooltips for playlists whose names do not fit in the sidebar.
• Improved lyric display behavior around song starts and instrumental gaps,
  plus background reading-engine shutdown and related interface details.

The complete package includes launcher 1.0.0.3. This release was validated
with the full Release staging workflow, repository and translation checks,
project persistence tests, lyrics and reading-service tests, OBS overlay tests,
and clean-package startup and manifest verification.