Add bridge page controller and helpers.

app/javascript/bridge/initializers/bridge_element.js

@@ -0,0 +1,13 @@
+import { BridgeElement } from "@hotwired/hotwire-native-bridge"
+
+BridgeElement.prototype.isDisplayedOnPlatform = function() {
+  return !this.hasClass("hide-on-native")
+}
+
+BridgeElement.prototype.showOnPlatform = function() {
+  this.element.classList.remove("hide-on-native")
+}
+
+BridgeElement.prototype.hideOnPlatform = function() {
+  this.element.classList.add("hide-on-native")
+}

app/javascript/bridge/initializers/index.js

@@ -1 +1 @@
-// Bridge initializers live here.
+import "bridge/initializers/bridge_element"