feat: share links and passwords in embed mode

[dschmidt]

Description

Change the "copy link and password" action in CreateLinkModal in embed mode to actually pass link(s) and password(s) to the parent application.

Related Issue

• Fixes "Copy link and password" action makes no sense when creating multiple links #1592
  This is not the expected outcome, but I think it's the better solution. The ticket suggest to remove the button, I think it's better to pass the password with the url to the parent application. That way the parent application can insert the password with the link into a chat message or an email.
  Yes, second channel would be better - but let's be honest, being forced to use a password in the default configuration is annoying enough for most users (me included).

How Has This Been Tested?

• using it in a roundcube plugin I'm working on :)
• easiest way to test this is to replace postMessage<Array<{ url: string; password?: string }>> with console.log and open OpenCloud with ?embed=true

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)

[Copilot]

Pull Request Overview

This PR enhances the embed mode functionality by allowing the parent application to receive both share links and passwords when creating links, rather than only copying them to the clipboard. The change enables better integration scenarios, such as inserting links with passwords directly into chat messages or emails.

• Modified the "Copy link and password" button behavior in embed mode to emit structured data to the parent application
• Introduced a new event owncloud-embed:share-links that includes both URLs and optional passwords
• Maintained backward compatibility by keeping the deprecated opencloud-embed:share event

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[JammingBen]

Thank you!