feat: migrate to vue 3 (#2689)

---------

Co-authored-by: Joep <jcbuhre@gmail.com>
Co-authored-by: Omar Hussein <omarmohammad1951@gmail.com>
Co-authored-by: Oleg Lobanov <oleg@lobanov.me>

frontend/src/utils/css.ts

@@ -0,0 +1,28 @@
+export default function getRule(rules: string[]) {
+  for (let i = 0; i < rules.length; i++) {
+    rules[i] = rules[i].toLowerCase();
+  }
+
+  let result = null;
+  const find = Array.prototype.find;
+
+  find.call(document.styleSheets, (styleSheet) => {
+    result = find.call(styleSheet.cssRules, (cssRule) => {
+      let found = false;
+
+      if (cssRule instanceof window.CSSStyleRule) {
+        for (let i = 0; i < rules.length; i++) {
+          if (cssRule.selectorText.toLowerCase() === rules[i]) {
+            found = true;
+          }
+        }
+      }
+
+      return found;
+    });
+
+    return result != null;
+  });
+
+  return result;
+}