v0.7.0

Changed

• Syntax highlighting now runs on a background thread and prewarms the whole
  diff: the visible lines color first and the rest fill in behind them, so the
  redraw never stalls (notably on Markdown, which is expensive to highlight) and
  scrolling does not flash plain text onto already-loaded lines.
• The TUI now always starts with the diff focused (where annotating happens),
  rather than the top band — previously only single-commit reviews did so.
• jj revisions in the commit list now highlight their shortest unique change-id
  prefix in magenta, matching how jj itself renders change ids.