Summary

• Add Ctrl+Z / Ctrl+Shift+Z undo-redo support to layout review editing
• Add undo-redo support to scenario authoring for crowd placements, operational events, hazards, route guidance, and blocked connections
• Keep scenario text inputs using their native text undo while using scenario-level history for authoring changes

Related Issue

• None (application-only PR)

Area

• Engine
• Domain
• Application
• Docs
• Build
• Analysis
• Chore

Architecture Check

• I kept the dependency direction application -> domain -> engine.
• I did not add Qt UI code to src/domain.
• I did not add domain or application dependencies to src/engine.
• I used src/ as the include root.

Verification

• cmake --preset windows-debug
• cmake --build --preset build-debug
• ctest --preset test-debug
• Not run (reason below)

Risks / Follow-up

• Manual UI verification in the app is still recommended for layout review and scenario authoring undo-redo flows.