feat(gui): add computing unit tab shell

[gracecluvohio]

What changes were proposed in this PR?

This PR adds the computing unit tab to navigation and creates a shell for the page. It is part 2 of 3 of PR #3691.

Screen.Recording.2026-03-26.at.6.09.52.PM.mov

Any related issues, documentation, discussions?

Related to #3690

How was this PR tested?

Tested locally

Was this PR authored or co-authored using generative AI tooling?

No

[Xiao-zhen-Liu]

@gracecluvohio Please include test cases in this PR since you are introducing a new component.

[gracecluvohio]

@gracecluvohio Please include test cases in this PR since you are introducing a new component.

I added some simple test cases since the component doesn't have much functionality added for this PR, but for the next PR we will need to add more test cases. Please review it as it is for now though.

[chenlica]

@gracecluvohio Per our earlier discussion, please use "Compute" instead of "Computing Units" on the navigation bar.

[gracecluvohio]

@gracecluvohio Per our earlier discussion, please use "Compute" instead of "Computing Units" on the navigation bar.

Yes, it's been addressed in a commit in the next PR. Should I also revise it in this PR though?

[Xiao-zhen-Liu]

LGTM, please fix the formatting issue that causes CI to fail and we can merge it.