libghostty v0.0.6

Added

• ARGB color accessors: Cell.backgroundArgb and Cell.foregroundArgb
  return resolved colors as packed 32-bit ARGB ints, or null if unset.
  Callers handle the default themselves.
• RgbColor.toArgb32: convert an RgbColor to a packed 32-bit ARGB int
  with full opacity.
• Cell.graphemeLength: number of codepoints in the cell's grapheme
  cluster (0 for empty cells).

Changed

• Cell hot path: codepoint and wide are cached during row iteration
  to eliminate per-access FFI calls in the renderer hot loop.
• Row hot path: the raw row pointer is cached and invalidated when the
  iterator advances to a new row.

Fixed

• VS16 emoji width: multi-codepoint graphemes are no longer misclassified
  as narrow based on their first codepoint. The wide-cell fast path now only
  applies to single-codepoint cells, so an emoji base followed by VS16 is
  correctly marked wide.
• Wide-codepoint heuristic: replaced the hand-rolled Unicode range table
  in the wide-cell fast path with a single >= U+1100 check. The old table
  could mark some wide CJK codepoints as narrow without consulting the FFI
  width query.