feat(identity-wallet): wire IdentityListHome as home screen with identity detail navigation
- Replace HomeScreen rendering with IdentityListHome for the home step
- Add new 'identity_detail' step to OnboardingStep type for viewing a selected identity
- Add selectedDid and selectedDidDoc state variables to track selected identity
- Implement identity_detail block that reuses DIDDocumentScreen for detail view
- IdentityListHome 'onadd' button navigates to mode_select to add another identity
- IdentityListHome 'onselect' button navigates to identity_detail with selected DID and document
- ClaimSuccessScreen 'ondone' navigates to home (IdentityListHome)
Implements AC5.11 (multi-identity home with status badges), AC5.12 (add identity button),
and AC5.13 (preserve existing onboarding flow).