feat(map): persist city building tiles

src/features/workbench/map/city-scene-layers.ts

@@ -23,6 +23,7 @@ export const cityManifestSchema = z
   .object({
     schema_version: z.literal(1),
     name: z.string(),
+    generated_at: z.string().datetime({ offset: true }).optional(),
     bbox: z.tuple([
       z.number().min(-180).max(180),
       z.number().min(-90).max(90),
@@ -33,14 +34,29 @@ export const cityManifestSchema = z
     pipe_count: z.number().int().nonnegative(),
     asset_count: z.number().int().nonnegative(),
     notice: z.string(),
-    attribution: z.string()
+    attribution: z.string(),
+    tiles: z
+      .object({
+        buildings: z.object({
+          sha256: z
+            .string()
+            .regex(/^[a-f0-9]{64}$/)
+            .optional()
+        })
+      })
+      .optional()
   })
   .refine(({ bbox: [w, s, e, n] }) => w < e && s < n, "Invalid scene bounds");
+
+export function cityBuildingArchiveUrl(origin = window.location.origin) {
+  return new URL(`${CITY_ROOT}/buildings.pmtiles`, origin).href;
+}
+
 export function citySources(): Record<string, SourceSpecification> {
   return {
     [CITY_PREFIX + "buildings"]: {
       type: "vector",
-      url: `pmtiles://${window.location.origin}${CITY_ROOT}/buildings.pmtiles`,
+      url: `pmtiles://${cityBuildingArchiveUrl()}`,
       minzoom: 12,
       maxzoom: 16,
       attribution: