Proof Request screen — credential matching and selection

[mbunwe-victor]

Description

Implement the Proof Request screen (/presentation/request) — design screen Desktop-12.

UI spec

• Header: "Proof Request" with a back < button
• Subtitle: "Select a Credential to present to <verifier_name>"
• A list of matching credentials, each as a card with icon, credential name, and issuer name
• Tapping a credential card selects it and advances to Proof Details
• Bottom navigation bar consistent with the rest of the app

Acceptance criteria

• Verifier name is rendered from the parsed authorization request
• Credential list is populated from stored credentials (mock data for now)
• Credential matching against dcql_query / presentation_definition is stubbed — return all credentials as matching initially
• Selecting a credential navigates to /presentation/details with the credential passed as state
• Empty state handled gracefully (no matching credentials message)