Add panorama previews and repair beta export rendering

shared/protocol.ts

@@ -38,6 +38,14 @@ export const datasetSchema = z
       )
       .min(5)
       .max(100),
+    // Retain the capture's locations while viewpoints holds the saved selection.
+    availableViewpoints: z
+      .array(
+        pointSchema.extend({ id: z.string().regex(/^[a-zA-Z0-9_-]{1,64}$/) }),
+      )
+      .min(5)
+      .max(100)
+      .optional(),
     assets: z
       .array(
         z.object({
@@ -62,7 +70,7 @@ export const datasetSchema = z
         ? ["terrain.json.gz"]
         : [
             "map.png",
-            ...d.viewpoints.flatMap((point) =>
+            ...(d.availableViewpoints ?? d.viewpoints).flatMap((point) =>
               faces.map((face) => `${point.id}/${face}.png`),
             ),
           ];
@@ -75,9 +83,20 @@ export const datasetSchema = z
     }
     if (new Set(d.viewpoints.map((p) => p.id)).size !== d.viewpoints.length)
       ctx.addIssue({ code: "custom", message: "Viewpoint IDs must be unique" });
+    if (d.availableViewpoints) {
+      const ids = new Set(d.availableViewpoints.map((p) => p.id));
+      if (
+        ids.size !== d.availableViewpoints.length ||
+        d.viewpoints.some((p) => !ids.has(p.id))
+      )
+        ctx.addIssue({
+          code: "custom",
+          message: "Selection must use unique captured locations",
+        });
+    }
     if (new Set(d.assets.map((a) => a.path)).size !== d.assets.length)
       ctx.addIssue({ code: "custom", message: "Asset paths must be unique" });
-    for (const p of d.viewpoints)
+    for (const p of [...d.viewpoints, ...(d.availableViewpoints ?? [])])
       if (
         p.x < d.bounds.minX ||
         p.x > d.bounds.maxX ||