refactor: replace jQuery with vanilla JS (keep animations) (@copilot)

[Copilot]

Description

Replace jQuery DOM manipulation, event handling, and utility calls with vanilla JavaScript while preserving jQuery for animations (.animate(), .fadeIn(), .fadeOut(), .stop()).

Scope: 1,539 jQuery calls across 109 files. This PR establishes the foundation and completes initial replacements.

Changes Made

• Created DOM utility module (utils/dom.ts, 460 lines)

  • Vanilla JS helpers for selection, class/attribute/style manipulation, DOM operations, traversal, events
  • Drop-in replacements for common jQuery patterns

• Created automation script (scripts/replace-jquery.js)

  • Bulk replacement tool for simple patterns
  • Preserves animation-related jQuery calls
  • Handles event listeners, class manipulation, DOM operations

• Replaced jQuery in 7 files (9 calls):

  • DOM manipulation: $("body").append() → document.body.insertAdjacentHTML()
  • Event handling: $(document).on() → document.addEventListener()
  • Class manipulation: .addClass() → .classList.add()
  • Element selection: $("#id")[0] → document.querySelector()
  • Event triggering: $().trigger("click") → .click()

Example

// Before
$(document).on("keydown", (event) => {
  currentCode = event.originalEvent.code || "KeyA";
});

// After
document.addEventListener("keydown", (event) => {
  currentCode = event.code || "KeyA";
});

Remaining Work

~1,530 jQuery calls remain across 102 files. Pattern distribution:

• Element selection: ~400 calls
• Event handlers: ~100 calls
• Class manipulation: ~95 calls
• DOM/attribute operations: ~100 calls
• Text/HTML/value operations: ~75 calls
• Complex chained operations and jQuery-dependent modules: ~760 calls

Checks

• Check if any open issues are related to this PR; if so, be sure to tag them below.
• Make sure the PR title follows the Conventional Commits standard.
• Make sure to include your GitHub username prefixed with @ inside parentheses at the end of the PR title.

Closes #

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• iojs.org
  • Triggering command: curl -q --fail --compressed -L -s REDACTED -o - (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

replace all jquery calls with vanilla js. keep using jquery for animations

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.