Fix readCards for public blob store

The get() function doesn't work with relative paths on public stores.
Use list() to find the blob URL, then fetch it directly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/store.ts

@@ -1,4 +1,4 @@
-import { del, get, put } from "@vercel/blob";
+import { del, list, put } from "@vercel/blob";
 import { mkdir, readFile, writeFile } from "node:fs/promises";
 import path from "node:path";
 
@@ -25,13 +25,13 @@ export const storageMode = hasBlobToken() ? "Vercel Blob" : "Local file";
 export async function readCards(): Promise<BoardCard[]> {
   if (hasBlobToken()) {
     try {
-      const result = await get(dataBlobPath, { access: "public" });
-      if (!result?.stream) {
-        return [];
-      }
+      const { blobs } = await list({ prefix: dataBlobPath, limit: 1 });
+      if (blobs.length === 0) return [];
 
-      const text = await streamToText(result.stream);
-      const parsed = JSON.parse(text) as BoardCard[];
+      const res = await fetch(blobs[0].url);
+      if (!res.ok) return [];
+
+      const parsed = (await res.json()) as BoardCard[];
       return Array.isArray(parsed) ? parsed : [];
     } catch {
       return [];
@@ -119,18 +119,3 @@ export function publicCards(cards: BoardCard[]) {
 function safeFileName(name: string) {
   return name.replace(/[^a-zA-Z0-9._-]/g, "-").replace(/-+/g, "-");
 }
-
-async function streamToText(stream: ReadableStream<Uint8Array>) {
-  const reader = stream.getReader();
-  const chunks: Uint8Array[] = [];
-
-  while (true) {
-    const { done, value } = await reader.read();
-    if (done) {
-      break;
-    }
-    chunks.push(value);
-  }
-
-  return Buffer.concat(chunks).toString("utf8");
-}