frontend: add Create-profile setup screen for brand-new accounts

LoginGate now shows CreateProfile (display name only) instead of App when
an authenticated session has no provisioned geniusrun profile yet, backed
by the new POST /api/setup endpoint and session/me's has_profile flag.

frontend/src/types/api.ts

@@ -189,6 +189,8 @@ export interface AuthResponse {
 export interface SessionInfo {
   name: string;
   email: string;
+  has_profile: boolean;
+  display_name?: string;
 }
 
 export interface DetailFillProgress {