feat(lightspeed): Add Developer Lightspeed Chat Popup/Button

[debsmita1]

Hey, I just made a Pull Request!

Resolves:
Part of https://issues.redhat.com/browse/RHIDP-9381

Solution description:

• This PR introduces chatbot display modes for the Lightspeed plugin:
  - Overlay - Chatbot appears as a floating overlay
  - Docked - Chatbot docks to the side of the window
  - Fullscreen - Chatbot expands to full screen with a dedicated route, appending the active conversation ID to the URL (if one exists)
• Adds drawer state management utilities that enable seamless integration with ApplicationDrawer in RHDH
  - QuickstartDrawerStateExposer - Component to expose partial drawer state, which can be consumed by the ApplicationDrawer in RHDH (feat: add new drawer mount points rhdh#3947)
  - Separated Drawer content from the Drawer container for better reusability
• Lightspeed will now be accessed via a floating action button
• Persisting the input text message when switching modes
• Updated the QuickStarts plugin to follow the same

GIF:
On rhdh-plugins

Screen.Recording.2026-01-09.at.11.56.25.PM.mov

With active conversation switching to Full-screen mode

Screen.Recording.2026-01-09.at.11.58.05.PM.mov

on RHDH with Quickstarts drawer

Screen.Recording.2026-01-10.at.12.05.32.AM.mov

✔️ 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)

[rhdh-gh-app]

Important

This PR includes changes that affect public-facing API. Please ensure you are adding/updating documentation for new features or behavior.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@red-hat-developer-hub/backstage-plugin-global-floating-action-button	workspaces/global-floating-action-button/plugins/global-floating-action-button	patch	v1.7.1
app	workspaces/lightspeed/packages/app	none	v0.0.0
@red-hat-developer-hub/backstage-plugin-lightspeed	workspaces/lightspeed/plugins/lightspeed	minor	v1.1.2
@red-hat-developer-hub/backstage-plugin-quickstart	workspaces/quickstart/plugins/quickstart	patch	v1.8.1

[HusneShabbir]

@debsmita1 Thanks for the PR — the functionality works as expected. I have a few observations:

1. The placeholder text and the alert message below is not in sync with the Figma design.

2. In the chat history sidebar, the New Chat and Close buttons are swapped (for overlay & dock to window modes). The current behavior seems ideal, but it differs from what’s shown in Figma.

3. In both overlay and dock-to-window display modes, pinned chats are listed as collapsible in the Figma design, which appears to be missing in this PR.

4. Tests are failing because the Lightspeed plugin is not present in the navigation sidebar. This might require minor tweaks in the existing tests. /cc @jrichter1

Please take a look and let me know your thoughts.

[HusneShabbir]

@debsmita1 can you please merge PR debsmita1#3?
With those changes in place, I’m expecting the tests to pass.

[invincibleJai]

/retest

[HusneShabbir]

/lgtm

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
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

[aprilma419]

lgtm!