Use neutral badges for automated PR comments

[mtsgrd]

Replace purple Agent badges with the existing light-gray variant and remove the purple card background and border tint. Automated comments remain identifiable by a single Agent badge, with circular avatars and standard card styling.

Validation: Lite typecheck, oxlint, Knip, formatting checks, and inspection of React Compiler output for the author component. The PR comment feed is not covered by the screenshot catalogue; screenshots have not been captured.

[github-actions]

This pull request changes Lite's UI, so it is labelled screenshots needed. Before/after screenshots make it reviewable without checking the branch out.

Attach them however you like — drag images straight into a comment, or have an agent capture them for you (the lite-screenshots skill in this repository does it against seeded fixtures).

Swap the label for screenshots once they are posted, or remove it if this change is not visual. Either sticks — this is asked once per pull request, so later pushes will not put it back.

cc @PavelLaptev — visual change.

[mtsgrd]

Ad hoc before/after captures of the running Lite app, showing the same Copilot review on PR #15874. Captured with this branch unapplied/applied. This state is not covered by the screenshot catalogue.

Before	After

[Copilot]

🟢 Approval recommended

No unresolved issues were identified that would block approval.

Pull request overview

Updates Lite PR comment styling so automated comments use neutral badges and standard card appearance.

Changes:

• Uses the existing lightGray Agent badge consistently.
• Removes purple agent-specific card styling.
• Preserves circular avatars and compact thread layout.

File summaries

File	Description
apps/lite/ui/src/routes/project/$id/workspace/PullRequestComments.tsx	Updated as part of this pull request.
apps/lite/ui/src/routes/project/$id/workspace/PullRequestComments.module.css	Updated as part of this pull request.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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