[FIX] Change scoping of mlrun root element

[muli-cohen]

📝 Description

When MLRun UI runs as a Module Federation remote inside the igz host, its theme tokens (--sidebar-*, --primary, etc.) were declared on :root, the same selector the host uses. Whichever stylesheet loaded last won, so after visiting /projects the host /admin sidebar turned purple until a hard refresh as well as other css abnormalities.

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🛠️ Changes Made

• src/tailwind.css: theme token block selector changed from :root to .ml-app, :where(:root)
  • .ml-app keeps the MLRun theme inside the MLRun app tree
  • :where(:root) is a zero-specificity fallback for standalone mode that always loses to the host's :root

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✅ Checklist

• I have given the PR a well-structured title describing the domain and the specific change that was made
• I tested the changes in the browser (locally or via preview build)
• I checked that this change doesn’t introduce new console warnings or lint / formatting errors
• I updated the relevant Jira ticket with the appropriate details and status

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🔗 References

• Related ticket / issue: ORIS-4487
• Figma / design spec: N/A
• Documentation: N/A

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🚨 Potentially Breaking Changes

• Yes
• No

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Includes DRC change

• Yes
• No

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🔍 Additional Notes

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📸 Screenshots / Demos

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