feat: implement Assets page support with Carbon Design System (#28)

[chethanac15]

What does this PR change?

• Assets Page Support: Built the new 'Assets' page using Carbon v11, and migrated the logic to TypeScript for better maintainability.
• Visualization: Added a Recharts donut chart to show cost distribution across asset types at a glance.
• Search/Filter: Integrated TableToolbarSearch so users can quickly find specific resources in large clusters.

Does this PR relate to any other PRs?

• Submission for the LFX Mentorship Term 1 2026 challenge.

How will this PR impact users?

• Users can now actually see and search their infrastructure assets (Nodes, Disks, etc.) within the UI instead of just relying on the API.

Does this PR address any GitHub or Zendesk issues?

• Closes Support Assets in the UI #28

How was this PR tested?

• Verified locally with npm run serve and npm run build to confirm the TS compilation and layout are solid.

Does this PR require changes to documentation?

• No.

Have you labeled this PR and its corresponding Issue as "next release" if it should be part of the next OpenCost release? If not, why not?

• No. This PR is part of a mentorship coding challenge and serves as an initial implementation rather than a finalized release feature.

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