Kiosk intake: 45-second inactivity reset to Welcome screen

_KioskLayout inactivity timer now reads ViewBag.InactivityTimeoutMs
(defaults to 5 min). PopulateKioskViewBagFromSession sets it to 45 s
on every intake step so an abandoned form auto-returns to the waiting
screen. Welcome screen and Confirmation page are unaffected.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Controllers/KioskController.cs

@@ -717,5 +717,9 @@ public class KioskController : Controller
 
         ViewBag.SessionToken = session.SessionToken;
         ViewBag.SessionType  = session.SessionType;
+
+        // Reset to Welcome screen after 45 s of inactivity on any intake step.
+        // The Welcome screen itself stays on indefinitely (no timeout override there).
+        ViewBag.InactivityTimeoutMs = 45_000;
     }
 }