Add map import and export with durable refresh progress

lib/process-uploads.ts

@@ -0,0 +1,22 @@
+import "server-only";
+import { after } from "next/server";
+import { admin } from "./supabase";
+import { processFabricJob } from "./fabric-jobs";
+
+export function processUploadAfterResponse(datasetId: string) {
+  after(async () => {
+    try {
+      const deadlineAt = Date.now() + 250000;
+      for (let attempt = 0; attempt < 3; attempt++) {
+        const state = await processFabricJob(admin(), datasetId, deadlineAt);
+        if (state !== "queued" || deadlineAt - Date.now() < 20000) break;
+        await new Promise((resolve) => setTimeout(resolve, 2500));
+      }
+    } catch (error) {
+      console.error(
+        "Vercel upload worker:",
+        error instanceof Error ? error.message : error,
+      );
+    }
+  });
+}