implement signature preview

app/javascript/elements/flow_area.js

@@ -1,5 +1,18 @@
 export default class extends HTMLElement {
   setValue (value) {
-    this.innerHTML = value
+    const { fieldType } = this.dataset
+
+    if (fieldType === 'signature') {
+      [...this.children].forEach(e => e.remove())
+
+      const img = document.createElement('img')
+
+      img.classList.add('w-full', 'h-full', 'object-contain')
+      img.src = value.url
+
+      this.append(img)
+    } else {
+      this.innerHTML = value
+    }
   }
 }