v0.4.0

[0.4.0] - 2026-09-04

Improved

• Refactored multigrid rendering around an explicit compositor frame with
  shared layer geometry, clipping, paint order, and semantic layer context.
• Routed mouse hit testing through compositor layers, including topmost float
  selection and drag/release capture for the original grid.
• Centralized highlight resolution for default colors, floating surfaces,
  reverse, blend, dim, cursor, decorations, and inline composition text.
• Separated Neovim's logical cell spans from glyph metrics; wide cells now
  follow protocol continuation markers and Nerd Font symbols no longer consume
  adjacent padding cells.
• Calculated IME cursor offsets from Unicode grapheme and display-width rules,
  including the ambiwidth and emoji UI options.