[Test] Build Escalation Atlas route with lane summaries

[iamasx]

Summary

Build an escalation-atlas route with escalation lanes, owner summaries, and a compact follow-up section.

Scope

• Add a new escalation-atlas route.
• Create mock escalation, owner, and follow-up data.
• Build lane sections, owner summaries, and a follow-up section.
• Aim for roughly 400-500 changed lines overall, staying reasonably close to that range.

Acceptance Criteria

• The route displays escalation lanes and supporting details.
• Owner and follow-up content is visible.
• The layout is responsive and readable.
• Tests cover the key render paths.
• Final PR diff is roughly 400-500 changed lines.

[iamasx]

Implementation plan:

• Add the escalation-atlas route shell and route-specific mock data.
• Build escalation lane, owner summary, and follow-up components.
• Compose the route with clear lane structure and responsive presentation.
• Add visual polish and route-level tests.
• Run local checks and keep the final diff near the 400-500 line target.