refactor!: drop SortableJS dependency

[ghiscoding]

vibe coded with copilot using Claude Sonnet 4.6

I first tried to migrate from SortableJS to @formkit/drag-and-drop in another branch refactor/formkit-dnd but copilot suggested that we could actually drop the use of any external dependency and use native code with about ~350 loc. Note that this wouldn't get merged until the next major version (next year) since that could impact some E2E tests (I had to add a custom Cypress drag command to make my tests pass).

Comparing the build size of my Salesforce standalone script zip file, dropping SortableJS drops about ~10Kb (as a comparison, when I tried to migrate to @formkit/drag-and-drop, that dropped only about ~2.5Kb, so dropping SortableJS entirely has a much larger decrease in size).

TODOs

• not working with touch and drag
• issues remaining with Firefox Linux
  • problems with Header Menu, Column Picker
  • !(e.target as HTMLElement)?.closest('.slick-header-menu-button')

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (3567aab) to head (14c1d27).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2634    +/-   ##
========================================
  Coverage   100.0%   100.0%            
========================================
  Files         200      201     +1     
  Lines       25313    25631   +318     
  Branches     8951     9029    +78     
========================================
+ Hits        25313    25631   +318     

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <100.0%> (ø)

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[ghiscoding]

converting to Draft since I mainly want to see if all tests are passing, if confirmed then I'll probably close the branch and just resurrect it in our next major version in 2027-Q1. I mainly wanted to use my leftover copilot tokens before the next month rolls in

cc @zewa666

EDIT

After trying it on my linux laptop, I had to patch a few things for Firefox Linux, and also told the AI to patch for any Safari issues as well. Now it's still shaving 10Kb from my zip file but it's now increased from 100 loc to 350 loc (as per codecov), probably still worth it but quite different compared to the original AI assumption 🤔

EDIT 2

hmm I found some more issues mostly with Firefox Linux, but also issues in other browsers with touch though it works fine with touch and SortableJS. I might give up on this trial, the other lib also has problems with touch, so it seems SortableJS is still better even if bigger

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commit: 14c1d27