Add bridged share button to board and card permas

app/javascript/controllers/bridge/share_controller.js

@@ -0,0 +1,45 @@
+import { BridgeComponent } from "@hotwired/hotwire-native-bridge"
+
+export default class extends BridgeComponent {
+  static component = "share"
+
+  share() {
+    const type = this.bridgeElement.bridgeAttribute("share-type")
+    switch (type) {
+      case "card-url":
+        this.send("shareCardUrl", this.#data(type))
+        break
+      default:
+        this.send("shareUrl", this.#data(type))
+    }
+  }
+
+  #data(type) {
+    return {
+      title: document.title,
+      url: window.location.href,
+      ...this.#additionalDataFor(type)
+    }
+  }
+
+  #additionalDataFor(type) {
+    switch (type) {
+      case "card-url":
+        return {
+          author: this.#author,
+          dateAdded: this.#dateAdded
+        }
+      default:
+        return null
+    }
+  }
+
+  get #author() {
+    return document.querySelector(".card__meta-text--author strong")?.textContent?.trim() ?? null
+  }
+
+  get #dateAdded() {
+    const timestamp = document.querySelector(".card__meta-text--added time")?.dateTime
+    return parseInt(timestamp) || null
+  }
+}