feat(tech-radar): migrate UI from Material UI to Backstage UI

[jaisuriyaNatarajan]

Hey, I just made a Pull Request!

Migrates the Tech Radar plugin UI from Material UI to Backstage UI (@backstage/ui), including dialog/layout CSS fixes, README callout, example-app BUI CSS imports, and a major changeset.

Related: #7869 #7534

Screen shots

1. tech-radar-overview

2. tech-radar-entry-dialog-typescript

3. tech-radar-filter-react

4. tech-radar-filtered-react-result

✔️ 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)
• All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @backstage-community/plugin-argocd
• @backstage-community/plugin-playlist
• @backstage-community/plugin-rbac-backend
• @backstage-community/plugin-tekton

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage-community/plugin-argocd	workspaces/argocd/plugins/argocd	none	v2.10.0
@backstage-community/plugin-playlist	workspaces/playlist/plugins/playlist	none	v0.22.0
@backstage-community/plugin-rbac-backend	workspaces/rbac/plugins/rbac-backend	none	v7.17.0
app-next	workspaces/tech-radar/packages/app-next	none	v0.0.3
app	workspaces/tech-radar/packages/app	none	v0.0.3
@backstage-community/plugin-tech-radar	workspaces/tech-radar/plugins/tech-radar	major	v1.21.0
@backstage-community/plugin-tekton	workspaces/tekton/plugins/tekton	none	v3.41.0

[hopehadfield]

Hey @jaisuriyaNatarajan! Thanks for the contribution😄 Looks like the CI is failing (you'll need to run yarn dedupe). Can you please take a look at this?

[jaisuriyaNatarajan]

Hey @jaisuriyaNatarajan! Thanks for the contribution😄 Looks like the CI is failing (you'll need to run yarn dedupe). Can you please take a look at this?

Hey @jaisuriyaNatarajan! Thanks for the contribution😄 Looks like the CI is failing (you'll need to run yarn dedupe). Can you please take a look at this?

Hi @hopehadfield

Thanks for the review and for flagging the CI failure — I’ve pushed a fix.

I ran yarn dedupe in workspaces/tech-radar and updated yarn.lock. The Verify lockfile duplicates step should pass on the latest commit now.

Let me know if anything else comes up on the PR