feat: set maxWidth for scaling and reduce gap sizes

[Lasserich]

What this PR does / why we need it:

Currently opening the UI on an ultra wide screen renders is very hard to dissect for my eyes having to travel a lot. Having an optimized version for standard screen size and only expand the grey part afterwards mitigates

This was done across Projects, Workspaces and MCPs screen for uniformity.

Before:

After:

[cla-assistant]

All committers have signed the CLA.

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[lucasgoral]

Approved

[Hubert-Szczepanski-SAP]

Could we please create css class and use it instead of inline styles? :)

all styles are the same and if we could wrap it within a class, it would be easier to change it in the future (just in one place, not in few)