Add template display (title and logo) to CredentialView

[Copilot]

The CredentialView lacked direct access to the template display info (title/name and logo), requiring consumers to dig through credential_configuration.credential_metadata.display[0].

Description of change

Adds a top-level display field to Credential (which serves as CredentialView) populated from the first entry in credential_configuration.credential_metadata.display during the view update. Only view logic is touched — no commands or HTTP request models were modified.

• credential/aggregate.rs: Added display: Option<CredentialConfigurationsSupportedDisplay> field to Credential
• credential/openapi.rs: Extracted display_item() helper; added public display_schema() for the new field's OpenAPI schema — the existing display() array schema reuses it
• credential/views/mod.rs: Populated self.display from credential_configuration.credential_metadata.display in the UnsignedCredentialCreated handler

// Before: consumers had to navigate nested structure
credential.credential_configuration.credential_metadata?.display?[0].name

// After: directly accessible
credential.display?.name
credential.display?.logo

Links to any relevant issues

How the change has been tested

Existing agent_issuance and agent_api_http unit tests pass with the changes. The new display field is populated whenever UnsignedCredentialCreated is processed; SignedCredentialCreated-only credentials leave it None.

Definition of Done checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have successfully tested this change in a docker environment

Original prompt

Add the template title and logo to the CredentialView, so the user knows which template was used to create the credential. Only update the view logic and don't touch any request models.

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