feat(tui): new theme + Catppuccin syntax highlighter #350

Job	Run time
release-validate	10s
test (3.13)	8m 13s
nix-test (macos-14, aarch64-apple-darwin, dist/pythinker)	3m 24s
test (3.14)	6m 29s
nix-test (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/pythinker)	1m 22s
nix-test (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/pythinker)	1m 57s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/onefile/pythinker)	3m 19s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/onefile/pythinker)	3m 8s
build (windows-2025-vs2026, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe, true)	3m 9s
test (3.12)	8m 36s
check	53s
build (macos-14, aarch64-apple-darwin, dist/onefile/pythinker)	2m 14s
build (windows-2022, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe)	4m 2s
	46m 56s

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