add custom port number support

src/app/browser/window/tab/item/page.rs

@@ -523,7 +523,14 @@ impl Page {
 
         // Implement shared [SocketConnectable](https://docs.gtk.org/gio/iface.SocketConnectable.html) interface
         // * required also on `auth` step ([SNI](https://geminiprotocol.net/docs/protocol-specification.gmi#server-name-indication))
-        let connectable = NetworkAddress::new(&uri.host().unwrap(), 1965);
+        let connectable = NetworkAddress::new(
+            &uri.host().unwrap(),
+            if uri.port().is_positive() {
+                uri.port() as u16
+            } else {
+                1965
+            },
+        );
 
         // Create connection
         client.connect_async(