add optional shared link to templates

app/javascript/elements/check_on_click.js

@@ -0,0 +1,14 @@
+export default class extends HTMLElement {
+  connectedCallback () {
+    this.addEventListener('click', () => {
+      if (!this.element.checked) {
+        this.element.checked = true
+        this.element.dispatchEvent(new Event('change', { bubbles: true }))
+      }
+    })
+  }
+
+  get element () {
+    return document.getElementById(this.dataset.elementId)
+  }
+}