More JavaScript turned into Stimulus

[elia]

Summary

This is a simple translation of existing JS into Stimulus with the minimal amount of work needed to make it work. No attempt was made at improving or fixing the overall architecture.

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• [ ] I have written a thorough PR description.
• [ ] I have kept my commits small and atomic.
• [ ] I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[codecov[bot]]

Codecov Report

Merging #344 (56dae24) into main (9c27457) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #344      +/-   ##
==========================================
- Coverage   97.13%   97.13%   -0.01%     
==========================================
  Files         190      190              
  Lines        4500     4497       -3     
==========================================
- Hits         4371     4368       -3     
  Misses        129      129              

Impacted Files	Coverage Δ
templates/app/views/carts/_cart_header.html.erb	100.00% <ø> (ø)
templates/app/views/carts/_cart_item.html.erb	100.00% <ø> (ø)
templates/app/views/carts/show.html.erb	100.00% <100.00%> (ø)
templates/app/views/layouts/_top_bar.html.erb	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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