[#1794] Redesign case detail-page header

[jiromaykin]

issue: https://taiga.maykinmedia.nl/project/open-inwoner/task/1793
The newly. designed Dashboard component requires restructuring of the detail page grid + has impact on Contactmoment detail page.
Also: Anchormenu references need to be removed for Case detail
(and from Case list in other PR).

Note: unsure which variable is needed for "Verwachte uitslag" (now set to end_date_legal)

[codecov-commenter]

Codecov Report

Merging #824 (e455d7b) into develop (c2da1ed) will increase coverage by 0.08%.
Report is 14 commits behind head on develop.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #824      +/-   ##
===========================================
+ Coverage    93.01%   93.10%   +0.08%     
===========================================
  Files          744      748       +4     
  Lines        25951    25828     -123     
===========================================
- Hits         24138    24046      -92     
+ Misses        1813     1782      -31     

Files	Coverage Δ
src/open_inwoner/cms/cases/tests/test_htmx.py	20.96% <ø> (+1.27%)	⬆️
..._inwoner/components/templatetags/dashboard_tags.py	100.00% <ø> (ø)
...rc/open_inwoner/openzaak/tests/test_case_detail.py	100.00% <ø> (ø)

... and 32 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[pi-sigma]

The spinner on the detail page is no longer centered after the removal of the sidebar anchors (see screenshot). Is this something that will be fixed in a separate PR?

[jiromaykin]

The spinner on the detail page is no longer centered after the removal of the sidebar anchors"

I've fixed it in this PR for the Detail page only - but it should actually be simplified and homogenised in another PR for the List view after this is merged (because the sidebar is going to be removed in all Aanvragen pages), so I'll have remember that.

[pi-sigma]

Looking good (flaky tests but seems alright now).

[jiromaykin]

Looking good (flaky tests but seems alright now).

Strangely enough the tests suddenly passed through this morning (after 3 days) - odd!

[Bartvaderkin]

Are we sure about these magic numbers as breakpoints? I see @media (min-width: 768px) { here but in the file above there is @media (min-width: 767px) {

[jiromaykin]

Ah: min-width should be 768px everywhere, but max-width should be 767px