[openstreetmap/openstreetmap-website] Remove jQuery (Issue #7142)

[RunLumi AI]

cschanhniem left a comment (openstreetmap/openstreetmap-website#7142)

Removing jQuery is a meaningful modernization step. A few things to consider for the migration strategy:

1. **Stimulus usage** — Since OSM-website already uses Stimulus controllers for most JS interactions, jQuery removal is largely about replacing `$.ajax` with `fetch` and `$.each`/`$.map` with native Array methods.
2. **DOM manipulation** — The main jQuery holdouts I've seen are in the note layer (`app/assets/javascripts/note.js`) and the history viewer. `querySelector` + `classList` replacements are straightforward there.
3. **Deferred pattern** — `$.Deferred` usage in the map UI code can be replaced with native Promise or `async/await`.

The incremental approach (remove jQuery from one module at a time rather than a big-bang rewrite) is probably safest given the test coverage situation. Happy to help review individual module PRs.

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