UI fixes and improvements

[j3ll3yfi5h]

Fixes#3030
Fixes#5034

• introduce four main sections with z-indexes
• position mainsections sticky instead absolute/fixed
• prevent duplicate nav markup
• improve table overflowing
  • Collections
  • Entries
  • Terms
  • Assets
  • Fieldsets
  • Forms
  • Form Submissions
  • Users
  • User Groups
• prevent popover overflows
• change <header> children margins to flex gaps and fix overflowing headings

[jasonvarga]

Is the update to package-lock.json necessary? If not, please revert it.

[jasonvarga]

To make this easier to review, I'd stop adding items to the scope of this PR.

Additional UI issues can be fixed in separate PRs.

If/when you're done with the items you've outlined in the description, go ahead and mark this as ready for review.

[j3ll3yfi5h]

Alright. I'm currently using the changes on a client project to see, how it behaves and I'll make it ready for review by the end of the day. 👍

Change was made.

[jackmcdade]

All the table overflow stuff looks great!

Unfortunately the nav, section, and z-index stuff breaks all the fullscreen modes of Bard, Markdown, etc.

If you want to break this PR up, I can merge the table stuff today, or we can wait. Up to you.

[j3ll3yfi5h]

Oh, I did totally miss those fullscreen views, sorry!

I'll look into it, maybe there ist something we can do with the PortalVue.

[jackmcdade]

Or maybe it's mostly z-index? Previously each of those numbers had a purpose too (997, 998, etc) to account for the Bard Nav, main nav, etc etc.

[jackmcdade]

I also found that the table view gets way too tall

[j3ll3yfi5h]

I also found that the table view gets way too tall

This was in my opinion the nicest way to fix those popovers, which are causing scrollbars:

189731678-91540675-7005-478f-b7d8-ee1b3a7d2bd5.mov

At least ten fields in the filter without scrolling should work in my opinion - what is your opinion on this?

[jackmcdade]

Will be using this as inspiration for my work in #7559 — as it is right here I won't be able to merge it, but thank you for the hard work! It is most appreciated and valued.