Restore tap-to-begin kiosk welcome and add visitor/staff choice step.

After tapping begin, users pick Visitor or Staff icon cards before entering the respective check-in or sign-in flows.

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

tests/Feature/FrontdeskPhase7Test.php

@@ -113,7 +113,7 @@ class FrontdeskPhase7Test extends TestCase
 
         $this->get(route('frontdesk.kiosk.device', $device->device_token))
             ->assertOk()
-            ->assertSee('Visitor Check-in')
+            ->assertSee('Visitor check-in')
             ->assertSee('Welcome to')
             ->assertSee('Tap to begin');