feat(lightspeed): Add Escape key to cycle through display modes

[its-mitesh-kumar]

Description

• Adds Escape key functionality to cycle through chatbot display modes
• Pressing Escape transitions: Fullscreen → Docked → Overlay → Close (FAB only)
• Settings dropdown closes on first Escape; display mode cycles on subsequent presses
• Works correctly across all display modes without breaking existing functionality

UI after changes

Screen.Recording.2026-01-27.at.10.42.18.PM.mov

Fixes

• Fixed https://issues.redhat.com/browse/RHDHBUGS-2490

✔️ Checklist

• A changeset describing the change and affected packages. (more info)
• Added or Updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[its-mitesh-kumar]

/cc @HusneShabbir @aprilma419

[rhdh-gh-app]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@red-hat-developer-hub/backstage-plugin-lightspeed	workspaces/lightspeed/plugins/lightspeed	patch	v1.2.1

[HusneShabbir]

I've observed a deviation where using the keyboard's Escape key to exit the chat actions menu impacts the Lightspeed display mode. This issue occurs most of the time and is reproducible. Please find the attached recording for reference.

Screen.Recording.2026-01-27.at.11.53.54.PM.mov