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

src/entities/SharedEntities.ts

@@ -11,3 +11,10 @@ export interface ICoordinates {
   longitude: number;
 }
 
+export interface IRegion {
+  latitude: number;
+  longitude: number;
+  latitudeDelta: number;
+  longitudeDelta: number;
+}
+