vCard middle name handling

[plew99]

Fixes #605

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This change is 

[Copilot]

Pull Request Overview

This PR improves the vCard export logic by correctly handling names containing middle names and arbitrary whitespace.

• Switches from a two-item split to a whitespace-based split for full name parsing
• Assigns firstName as the first token and lastName as the last token, ignoring middle tokens
• Trims the input to remove leading/trailing whitespace

Comments suppressed due to low confidence (2)

frontend/js/datatables_vcard_export.ts:37

• [nitpick] Consider renaming names to nameParts or tokens to better convey that this array represents individual parts of the full name.

            const names = row[columnName].trim().split(/\s+/);

frontend/js/datatables_vcard_export.ts:37

• Add a unit test for vcard_export to cover cases where the name contains more than two words (middle names) to ensure first and last tokens are handled correctly.

            const names = row[columnName].trim().split(/\s+/);

[cytadela8]

A better solution would be to take all, but last word as first name and last word as last name.