Add initial region loading for supported systems

Expose an initialRegion field on the System GraphQL type so the app can
display the correct campus area on first load instead of a zoomed-out
default map view. Chapman University is configured with coordinates
centered on campus.

https://claude.ai/code/session_0162emnCi1KxW5FkTNn2ZrvH

testHelpers/apolloTestServerHelpers.ts

@@ -26,6 +26,12 @@ const systemInfoForTesting: InterchangeSystemBuilderArguments = {
   parkingSystemId: ChapmanApiBasedParkingRepositoryLoader.id,
   useSelfUpdatingEtas: false,
   shuttleStopArrivalDegreeDelta: 0.001,
+  initialRegion: {
+    latitude: 33.7937,
+    longitude: -117.8531,
+    latitudeDelta: 0.01,
+    longitudeDelta: 0.01,
+  },
 };
 
 export function buildSystemForTesting() {