feat(tui): TUI enhancements — adaptive theme, layout, and agent prompt overhaul #386

Job	Run time
check	48s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/onefile/pythinker)	2m 28s
test (3.13)	8m 28s
nix-test (macos-14, aarch64-apple-darwin, dist/pythinker)	3m 37s
build (windows-2022, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe)	3m 58s
release-validate	9s
nix-test (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/pythinker)	1m 56s
build (windows-2025-vs2026, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe, true)	4m 21s
test (3.14)	8m 23s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/onefile/pythinker)	3m 7s
build (macos-14, aarch64-apple-darwin, dist/onefile/pythinker)	2m 43s
nix-test (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/pythinker)	1m 25s
test (3.12)	9m 3s
	50m 26s

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