feat: add contact-cryptokeys plugin UI slot

[paulhenry46]

Summary

In contact card, we add new UI slot to allow plugins to take cryptokeys and render them. See example in last section. If no plugins is available, we use the former UI where we see the dataURI. Of course, the slot or the former UI is shown only if there are keys.

Changes

• add contact-cryptokeys UI slot
• add ui:contact-cryptokeys permission

Related Issues

Closes #

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactor / code quality improvement
• Chore / dependency update / CI change

Checklist

• I have read the Contributing Guide
• My code follows the project's code style and conventions
• I have run npm run typecheck && npm run lint and there are no errors
• The build passes (npm run build)
• I have tested my changes locally
• I have added or updated documentation if needed
• I have updated translations (locales/) if my changes affect user-facing text
• I have included screenshots or a screen recording for UI changes

Screenshots / Demo

Example of how a crypto plugin could use this slot to decrypt the cryptokeys dataURI and show relevant info.

Notes for Reviewers

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