Demo: download zip file does not work

[javier-godoy]

Describe the bug

The "download zip file" button in the basic demo does not export the grid and it downloads an HTML page instead.

The anchor has an empty href

Expected behavior

The "download zip file" button must download a zip file.

Minimal reproducible example

https://addonsv23-staging.flowingcode.com/gridexporter/basic
https://addonsv24-staging.flowingcode.com/gridexporter/basic
https://addonsv25-staging.flowingcode.com/gridexporter/basic

Add-on Version

1.10.0-SNAPSHOT, 3.0.0-SNAPSHOT

Vaadin Version

23.3.35, 24.9.0, 25.0.3

Additional information

No response

[javier-godoy]

It's confusing, but it always worked like that 1e2eca1

GridExporterAddon/src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterDemo.java

Lines 101 to 103 in de34f21

	Anchor zipLink = new Anchor("", FontAwesome.Regular.FILE_ZIPPER.create());
	zipLink.setTitle("Download zip file");
	zipLink.getElement().setAttribute("download", true);

Back to triage so that we can discuss how to improve the demo.