test(places): the picture chosen in the editor, the gallery and the lightbox

Tests for the picker, the shared image field, staging and saving the picture,
the gallery hook and trigger, the lightbox's dialog, focus and reading
direction, the credit and the enrichment cache; the inspector, phone sheet,
details column, form and wiring tests follow the picture into the editor.
The picker's upload tile and credit line are components of their own, the
heading goes with an empty picker, the gallery's state names its place, and
'No picture' only shows when a picture is being removed.

client/src/components/Planner/placeImageChoice.ts

@@ -1,4 +1,6 @@
+import type { PlacePhotoCandidate } from '@trek/shared';
 import type { TripFile } from '../../types';
+import type { PlaceImageOwn } from './PlaceImagePicker';
 
 const PICKABLE = /^image\/(jpeg|png|gif|webp)$/;
 
@@ -46,3 +48,10 @@ export function pendingImagePayload(pending: PendingPlaceImage | null): PendingI
   if (!pending) return undefined;
   return pending.kind === 'upload' ? pending.file : { fileId: pending.file.id };
 }
+
+/** Whether the picker has a tile to show: its sources' photos, or a picture of the place's own, or an upload. */
+export function offersPictures(photos: readonly PlacePhotoCandidate[], own: PlaceImageOwn | undefined): boolean {
+  if (photos.length > 0) return true;
+  if (!own) return false;
+  return !!own.currentUrl || own.attached.length > 0 || !!own.pendingPreview || own.canUpload;
+}