Add support for new SSH key type `[email protected]`

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Brief Summary

Description:

I would like to report that KeePassXC currently does not support the new SSH key type [email protected].

When such keys are stored in KeePassXC and configured for SSH agent integration, the application is unable to recognize or load them automatically into the SSH agent. As a result, users must manually add these keys outside of KeePassXC, which defeats the purpose of the built-in SSH agent integration.

Steps to reproduce:

1. Generate or obtain an SSH key of type [email protected]
2. Store the private key in a KeePassXC entry
3. Enable SSH agent integration for the entry
4. Unlock the database

Expected behavior: KeePassXC should recognize this key type and automatically add it to the SSH agent.

Actual behavior: The key is not loaded into the SSH agent, and appears to be unsupported.

Additional information:

• KeePassXC version: KeePassXC 2.7.12
• Operating system: Arch linux
• OpenSSH version: OpenSSH_10.4p1

Please let me know if further details or testing are needed. Thanks for your work on KeePassXC!

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