ui improvement

src/features/onboarding/OnboardingPage.tsx

@@ -231,6 +231,23 @@ export function OnboardingPage() {
     persist(completeStep(state, step, nextOf(step)));
   }
 
+  /*
+  Each step of the wizard starts at the top of itself.
+
+  The steps are STATE, not routes, so the shell's own reset — which keys on the
+  pathname — never fires here: the URL is `/admin/onboarding` for all seven of
+  them. Finishing the inventory step from the bottom of a long list and
+  pressing Save & continue therefore opened the next step already scrolled past
+  its heading and its explanation, which is exactly the part a person setting
+  up a shop for the first time needs to read.
+
+  Instant, for the same reason the shell's is: this replaces the whole page
+  body, so there is nothing continuous for a smooth travel to connect.
+  */
+  useEffect(() => {
+    window.scrollTo({ top: 0, left: 0, behavior: 'instant' });
+  }, [step]);
+
   const heading = HEADINGS[step];
   const isFirst = step === 'welcome';
   const isLast = step === 'done';