feat(identity-wallet): wire IdentityInputScreen into page state machine
Adds import flow state variables (identityInfo, verifiedClaim, claimResult)
to support cross-screen data sharing during the claim flow. Imports
IdentityInputScreen component and adds rendering block that transitions
from mode_select to identity_input, then to pds_auth after resolution.
Updates form object with handleOrDid field for tracking user input.
Adds necessary type imports (IdentityInfo, VerifiedClaimOp, ClaimResult).