Add shared empty states, customer product filters, and SSO handoff across dashboards.

Standardize list empty UI, searchable country fields, customer-products filter row, password/login polish, and one-time business dashboard handoff from the customer app.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/dashboard-core/src/index.ts

@@ -9,6 +9,7 @@ export type {
   OtpSendResponse,
   OtpVerifyResponse,
   RegisterResponse,
+  HandoffCreateResponse,
   UserProfile,
 } from './types/auth'
 

packages/dashboard-core/src/types/auth.ts

@@ -65,3 +65,8 @@ export interface OtpVerifyResponse {
   verified: boolean
   message: string
 }
+
+export interface HandoffCreateResponse {
+  ticket: string
+  expiresInSeconds: number
+}