add native titles

app/javascript/elements/native_header.js

@@ -0,0 +1,14 @@
+export default class extends HTMLElement {
+  connectedCallback () {
+    window.webkit?.messageHandlers?.native?.postMessage({
+      type: 'header',
+      op: 'add',
+      title: this.dataset.label || this.querySelector('h1')?.textContent?.trim() || '',
+      search: 'search' in this.dataset
+    })
+  }
+
+  disconnectedCallback () {
+    window.webkit?.messageHandlers?.native?.postMessage({ type: 'header', op: 'remove' })
+  }
+}