library: Add Email Entry

src/Library/demos/Email/main.blp

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+using Gtk 4.0;
+using Adw 1;
+
+Adw.StatusPage {
+  title: "Email";
+  description: _("Compose an email");
+  margin-top: 48;
+
+  Box {
+    orientation: vertical;
+    halign: center;
+
+    Button button {
+      label: _("Send Email");
+      margin-bottom: 42;
+      halign: center;
+      styles ["suggested-action"]
+    }
+
+    LinkButton {
+      label: "API Reference";
+      uri: "https://libportal.org/method.Portal.compose_email.html";
+    }
+  }
+}

src/Library/demos/Email/main.js

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+import Xdp from "gi://Xdp";
+import XdpGtk from "gi://XdpGtk4";
+import Gio from "gi://Gio";
+
+const portal = new Xdp.Portal();
+const parent = XdpGtk.parent_new_gtk(workbench.window);
+
+const button = workbench.builder.get_object("button");
+
+function handleClick() {
+  portal.compose_email(
+    parent,
+    ["sonicworks05@gmail.com"],
+    ["sriyanshshivam1@gmail.com"],
+    null,
+    "Demo Message",
+    "Demo Content",
+    null,
+    Xdp.EmailFlags.NONE,
+    null,
+    (parent, result) => {
+      try {
+        portal.compose_email_finish(result);
+        log("Email sent");
+      } catch (e) {
+        logError(e);
+      }
+    },
+  );
+}
+
+button.connect("clicked", handleClick);

src/Library/demos/Email/main.json

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+{
+  "name": "Email",
+  "category": "platform",
+  "description": "Compose an email message",
+  "panels": ["code", "preview"],
+  "autorun": true
+}