Refresh the homepage and improve export and draft guidance

worker/main.ts

@@ -1,4 +1,5 @@
 import { createClient } from "@supabase/supabase-js";
+import { existsSync } from "node:fs";
 import { randomUUID, createHash } from "node:crypto";
 import { mkdir, writeFile, readFile, readdir, rm } from "node:fs/promises";
 import { gunzipSync } from "node:zlib";
@@ -6,6 +7,7 @@ import sharp from "sharp";
 import { datasetSchema, faces, type TerrainSnapshot } from "../shared/protocol";
 import { renderSnapshot } from "../renderer/render.mjs";
 import type { Database } from "../shared/database";
+if (existsSync(".env.local")) process.loadEnvFile(".env.local");
 const client = createClient<Database>(
   process.env.NEXT_PUBLIC_SUPABASE_URL!,
   process.env.SUPABASE_SECRET_KEY!,