Reset PurchaseSchedulesModal bundle state on each open

Previously the bundle stepper only re-synced when extraSchedules/stepSize
props changed. Opening the modal, typing a value, cancelling, and
reopening left the stale draft visible — confusing because the new total
on the summary no longer matched the user's intent.

The existing `lastSubmission as any` cast matches the codebase's
established pattern (8 other sites) — left as-is rather than diverging.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: samejr

apps/webapp/app/components/schedules/PurchaseSchedulesModal.tsx

@@ -65,13 +65,18 @@ export function PurchaseSchedulesModal({
 
   const stepSize = schedulePricing.stepSize;
   const [bundles, setBundles] = useState(Math.round(extraSchedules / stepSize));
-  useEffect(() => {
-    setBundles(Math.round(extraSchedules / stepSize));
-  }, [extraSchedules, stepSize]);
   const amountValue = bundles * stepSize;
   const isLoading = fetcher.state !== "idle";
 
   const [open, setOpen] = useState(false);
+  // Reset the bundle stepper to the user's current extra-schedules count on
+  // each open. Earlier this only re-synced when `extraSchedules`/`stepSize`
+  // props changed, so if the user opened the modal, typed a value, cancelled,
+  // and reopened without purchasing, the stale draft persisted.
+  useEffect(() => {
+    if (open) setBundles(Math.round(extraSchedules / stepSize));
+  }, [open, extraSchedules, stepSize]);
+
   useEffect(() => {
     const data = fetcher.data;
     if (