feat(tui): TUI enhancements — adaptive theme, layout, and agent prompt overhaul #389

Job	Run time
check	44s
release-validate	14s
nix-test (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/pythinker)	1m 29s
nix-test (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/pythinker)	1m 57s
nix-test (macos-14, aarch64-apple-darwin, dist/pythinker)	2m 51s
test (3.14)	8m 7s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/onefile/pythinker)	2m 38s
build (windows-2025-vs2026, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe, true)	3m 45s
test (3.13)	8m 8s
build (macos-14, aarch64-apple-darwin, dist/onefile/pythinker)	1m 54s
build (windows-2022, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe)	4m 44s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/onefile/pythinker)	3m 17s
test (3.12)	7m 10s
	46m 58s

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