Polish workflow workstation layout

[shiny-code-bot]

Summary

• make the Home selected-work panel border follow the selected workflow state tone
• tighten Folder Studio's command surface with denser folder facts, left-aligned actions, and state-toned review workspace framing
• fix narrow Folder Studio decision facts so workflow state details stack without horizontal pressure

Refs #129

Validation

• npm --prefix frontend run check
• npm --prefix frontend run lint
• npm --prefix frontend test
• npm --prefix frontend run build
• npm --prefix frontend run smoke:web
• manual browser validation on seeded Work and Folder Studio routes at desktop and 390px mobile widths; mobile decision facts computed as one column with zero horizontal overflow
• bash scripts/pre-commit-check.sh