feat(tui+lsp): TUI theme system, streaming phase 0, LSP subsystem, and report panel polish #556

Job	Run time
release-validate	10s
check	13s
test (3.12)	9m 1s
test (3.13)	9m 44s
test (3.14)	8m 52s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/onefile/pythinker)	2m 36s
build (windows-2022, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe)	3m 38s
build (macos-14, aarch64-apple-darwin, dist/onefile/pythinker)	2m 22s
nix-test (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/pythinker)	1m 52s
nix-test (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/pythinker)	1m 25s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/onefile/pythinker)	3m 8s
nix-test (macos-14, aarch64-apple-darwin, dist/pythinker)	3m 42s
build (windows-2025-vs2026, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe, true)	5m 4s
	51m 47s

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