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>

apps/business/src/context/AuthContext.tsx

@@ -18,6 +18,7 @@ import {
   loginWithOtp as loginWithOtpRequest,
   logout as logoutRequest,
 } from '../services/authService'
+import { completeHandoffIfPresent } from '../lib/handoff'
 import { resolveTenantByDomain } from '../services/tenantService'
 import type { AuthUser } from '../types/auth'
 
@@ -93,12 +94,21 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     const controller = new AbortController()
 
     async function init() {
-      if (!getAccessToken()) {
-        if (!controller.signal.aborted) setIsLoading(false)
-        return
-      }
-
       try {
+        const handedOff = await completeHandoffIfPresent()
+        if (controller.signal.aborted) return
+
+        if (handedOff) {
+          await assertBusinessAccess(handedOff.user)
+          if (controller.signal.aborted) return
+          setUser(handedOff.user)
+          return
+        }
+
+        if (!getAccessToken()) {
+          return
+        }
+
         const { user: currentUser } = await fetchCurrentUser(controller.signal)
         if (controller.signal.aborted) return