feat: use drag and drop to change layer order

[mariobuikhuizen]

Description

This pull request adds support for changing layer order with drag and drop.

Change log entry

• Is a change log needed? If yes, is it added to CHANGES.rst? If you want to avoid merge conflicts,
  list the proposed change log here for review and add to CHANGES.rst before merge. If no, maintainer
  should add a no-changelog-entry-needed label.

Checklist for package maintainer(s)

This checklist is meant to remind the package maintainer(s) who will review this pull request of some common things to look for. This list is not exhaustive.

• Are two approvals required? Branch protection rule does not check for the second approval. If a second approval is not necessary, please apply the trivial label.
• Do the proposed changes actually accomplish desired goals? Also manually run the affected example notebooks, if necessary.
• Do the proposed changes follow the STScI Style Guides?
• Are tests added/updated as required? If so, do they follow the STScI Style Guides?
• Are docs added/updated as required? If so, do they follow the STScI Style Guides?
• Did the CI pass? If not, are the failures related?
• Is a milestone set? Set this to bugfix milestone if this is a bug fix and needs to be released ASAP; otherwise, set this to the next major release milestone. Bugfix milestone also needs an accompanying backport label.
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

Screen.Recording.2025-04-08.at.14.58.54.mov

[mariobuikhuizen]

I just found out drag and drop doesn't work in the popout. I'm working on this. [fixed]

[kecnry]

I merged main into this to get it up-to-date but am still having some issues where I don't see the actual viewer update. We'll also need to update the logic in get_active_image_layer so both the mouseover coordinates and #3514 can handle layer ordering by z-order rather than the order in the list (or alternatively, could/should this just update the layers list order directly?).

[kecnry]

this now seems to be working for me after another rebase 🎉 . We'll need to update the mouseover logic yet before merge, but can handle that on our end

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.52%. Comparing base (7c1bf61) to head (1297c50).

Files with missing lines	Patch %	Lines
...viz/configs/default/plugins/data_menu/data_menu.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3532   +/-   ##
=======================================
  Coverage   86.52%   86.52%           
=======================================
  Files         180      180           
  Lines       24706    24719   +13     
=======================================
+ Hits        21377    21389   +12     
- Misses       3329     3330    +1     

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[rosteen]

I pushed a couple commits here today to get subset deletion working (the layer was not properly disappearing from the data menu after the subset was deleted) and to get the mouseover coordinates to correctly pick up the top layer after drag and drop changes. There is one outstanding bug where occasionally the viewer will update but the layer dragged to the top will end up second from top in the data menu. Dragging it again puts it at the top of the data menu as intended:

Screen.Recording.2025-10-07.at.4.25.24.PM.mov

[javerbukh]

Both of the CI failures will be fixed once glue-jupyter releases with this PR glue-viz/glue-jupyter#493