planner: keep REFRESH_FIELDS inside its module; docker: leave shared/node_modules out of the build context

A checkout where npm install ran once carried shared/node_modules into the
image build, and its stale packages broke the client build with a vite that
lacked vite/internal.

.dockerignore

@@ -1,6 +1,7 @@
 node_modules
 client/node_modules
 server/node_modules
+shared/node_modules
 client/dist
 shared/dist
 data

client/src/components/Planner/placeRefresh.ts

@@ -3,7 +3,7 @@ import type { PlaceFormData } from './PlaceFormModal.helpers';
 import { cleanWeek, weekFromPeriods, writeWeek } from './placeHours';
 
 /** The details a saved place can take over from a fresh lookup. */
-export const REFRESH_FIELDS = ['website', 'phone', 'email', 'opening_hours'] as const;
+const REFRESH_FIELDS = ['website', 'phone', 'email', 'opening_hours'] as const;
 export type RefreshField = (typeof REFRESH_FIELDS)[number];
 
 /** One field where the lookup says something else than the place holds now. */