Summary

• Focus the sessions selection list so Termina paints the active row highlight.
• Add headless regression tests for visible highlight and long-list scrolling.

Validation

• PASS: dotnet test src/Netclaw.Cli.Tests/Netclaw.Cli.Tests.csproj --filter FullyQualifiedName~SessionsPageTests
• PASS: dotnet slopwatch analyze
• PASS: pwsh ./scripts/Add-FileHeaders.ps1 -Verify
• PASS: git diff --check
• ATTEMPTED: dotnet test (fails in unrelated Windows shell-dependent actor tests where pwd/sleep are unavailable)
• BLOCKED: ./scripts/smoke/run-smoke.sh sessions-tui (WSL lacks vhs, ttyd, ffmpeg; no noninteractive sudo to install)