libghostty(formatter): enable kitty gfx for vt#12182

neurosnap wants to merge 3 commits intoghostty-org:mainghostty-org/ghostty:mainfrom

neurosnap:libghostty-formatter-kitty-gfx-vtneurosnap/ghostty:libghostty-formatter-kitty-gfx-vtCopy head branch name to clipboard