Expose add login signer redirect metadata

[matt416]

Adds an opt-in includeMetadata mode to WDK completeRedirect so add-login-signer redirect callers can receive the new signer address, kind, and OAuth email alongside the redirect target.

Preserves the default Promise behavior for existing callers and only includes addedLoginSigner for add-signer redirect completions. Adds WDK wallet tests for the metadata response and the legacy string response.

Verified with WDK build, targeted wallets.test.ts, WDK typecheck, and WDK lint

[tolgahan-arikan]

Minor comment, not blocker:

The new metadata types are declared in wallets.ts but not re-exported from packages/wallet/wdk/src/sequence/index.ts. This means consumers can use the feature via inference, but cannot cleanly import/name CompleteRedirectWithMetadataArgs or CompleteRedirectMetadataResult from the public package entrypoint.

[matt416]

Confirmed — CompleteRedirectWithMetadataArgs and CompleteRedirectMetadataResult are exported from wallets.ts (lines 107 and 111) but not re-exported from packages/wallet/wdk/src/sequence/index.ts. The existing type block at line 10–25 of that file re-exports CompleteRedirectArgs and the other args types, but the two new metadata types are absent.

Consumers who rely on inference today will be fine, but anyone wanting to name or import either type directly (e.g. in a function signature or a satisfies constraint) will need to reach into the internal path or use ReturnType/Parameters workarounds.

Suggested fix — add the two types to the existing export type { ... } from './wallets.js' block:

CompleteRedirectWithMetadataArgs,
CompleteRedirectMetadataResult,