fix: restore styling for local characters list (#152)

assets/js/hooks/Mapper/components/hooks/useElementWidth.ts

@@ -0,0 +1,43 @@
+import { useState, useLayoutEffect, RefObject } from 'react';
+
+/**
+ * useElementWidth
+ *
+ * A custom hook that accepts a ref to an HTML element and returns its current width.
+ * It uses a ResizeObserver and window resize listener to update the width when necessary.
+ *
+ * @param ref - A RefObject pointing to an HTML element.
+ * @returns The current width of the element.
+ */
+export function useElementWidth<T extends HTMLElement>(ref: RefObject<T>): number {
+  const [width, setWidth] = useState<number>(0);
+
+  useLayoutEffect(() => {
+    const updateWidth = () => {
+      if (ref.current) {
+        const newWidth = ref.current.getBoundingClientRect().width;
+        if (newWidth > 0) {
+          setWidth(newWidth);
+        }
+      }
+    };
+
+    updateWidth(); // Initial measurement
+
+    const observer = new ResizeObserver(() => {
+      const id = setTimeout(updateWidth, 100);
+      return () => clearTimeout(id);
+    });
+
+    if (ref.current) {
+      observer.observe(ref.current);
+    }
+    window.addEventListener("resize", updateWidth);
+    return () => {
+      observer.disconnect();
+      window.removeEventListener("resize", updateWidth);
+    };
+  }, [ref]);
+
+  return width;
+}