fix(ui): make orphaned resources more visible

[dhruvac29]

Fixes #27718

This updates the orphaned resource styling in the application resource tree to make orphaned objects easier to distinguish from normal resources.

The change keeps the existing orphaned background color and adds a small warning-color accent strip, avoiding broader resource tree redesign or layout changes.

Validation:

• git diff --check

[bunnyshell]

✅ Preview Environment deployed on Bunnyshell

Component	Endpoints
argocd	https://argocd-hsaz6u.bunnyenv.com/
argocd-ttyd	https://argocd-web-cli-hsaz6u.bunnyenv.com/

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[Copilot]

Pull request overview

Updates the Application Resource Tree UI styling so orphaned resources are easier to visually distinguish, addressing #27718 without changing the overall layout.

Changes:

• Adds a warning-colored 4px accent strip (via a left-to-right linear gradient) to orphaned resource nodes.
• Preserves the existing orphaned node background color to keep the current visual baseline.

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[pjiang-dev]

@dhruvac29 Do you mind posting a screen shot of the UI change ?

[dhruvac29]

@pjiang-dev
I’m happy to attach the screenshot, but I don’t have Argo CD credentials for the preview environment yet, so I can’t access the resource tree to capture the before/after UI.

Could you share the preview login details or attach the screenshot from your side if it needs changes?

[crenshaw-dev]

@dhruvac29 you should run/test the changes locally.

[dhruvac29]

@crenshaw-dev
Thanks, that makes sense. I ran the UI locally and attached a screenshot of the orphaned resource styling.

The change is limited to the orphaned resource node state: it keeps the existing background and adds the warning-color accent on the left.