fix: enhance invoice download and electronic invoice processing

• Introduced a new JS script block in download.php which gets triggered when user session is not valid or on missing parameters invoice or type.
• Dialog.js has been modified to change how invoices are downloaded. Instead of creating an invisible iframe, now it leverages fetch API and download.js to get the invoice and proceed downloading.
• Corrected indentation of the text and button image in the dialog box of the invoice download.
• Invoice.php updated to include a new check for net value invoices. Adds articles to the ZugferdDocumentBuilder and calculates VAT based on the detected invoice type (net or gross). This ensures accurate electronic invoices.

merged

mentioned in commit 3a60a588

This MR is included in version 2.4.8

The release is available on GitLab release.

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