[Test] Build Transit Board route with corridor summaries

[iamasx]

Summary

Build a transit-board route with corridor summaries, movement cards, and a compact delay highlights panel.

Scope

• Add a new transit-board route.
• Create mock corridor, movement, and delay-highlight data.
• Build summary cards, movement cards, and a highlights panel.

Acceptance Criteria

• The route displays transit and movement information clearly.
• Delay highlights are visible.
• The layout works on narrow and wide screens.
• Tests cover the key render paths.

[iamasx]

Implementation plan:

• Add the transit-board route shell and route-specific mock datasets.
• Build corridor summary, movement card, and delay highlight components.
• Compose the route page with clear structure and responsive layout.
• Add styling polish and route tests.