refactor: use shared cookie utility in ebay scraper

Replace inline cookie loading with shared utility functions.
Now supports both JSON array and cookie string formats.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/core/src/scrapers/ebay.ts

@@ -1,6 +1,19 @@
 import { parseHTML } from "linkedom";
+import {
+  type CookieConfig,
+  formatCookiesForHeader,
+  loadCookiesOptional,
+} from "../utils/cookies";
 import { delay } from "../utils/delay";
 
+// eBay cookie configuration
+const EBAY_COOKIE_CONFIG: CookieConfig = {
+  name: "eBay",
+  domain: ".ebay.ca",
+  envVar: "EBAY_COOKIE",
+  filePath: "./cookies/ebay.json",
+};
+
 // ----------------------------- Types -----------------------------
 
 export interface EbayListingDetails {
@@ -323,54 +336,28 @@ function parseEbayListings(
 
 /**
  * Load eBay cookies with priority: URL param > ENV var > file
- * @param cookiesSource - Optional cookie string from URL parameter (highest priority)
- * @param cookiePath - Path to cookie file (default: ./cookies/ebay.json) (lowest priority)
- * @returns Cookie string for HTTP header or undefined if no cookies found
+ * Uses shared cookie utility for consistent handling across all scrapers
  */
 async function loadEbayCookies(
   cookiesSource?: string,
-  cookiePath = "./cookies/ebay.json",
 ): Promise<string | undefined> {
-  // Priority 1: URL parameter (if provided)
-  if (cookiesSource?.trim()) {
-    console.log("Loaded eBay cookies from URL parameter");
-    return cookiesSource.trim();
-  }
+  const cookies = await loadCookiesOptional(EBAY_COOKIE_CONFIG, cookiesSource);
 
-  // Priority 2: Environment variable
-  const envCookies = process.env.EBAY_COOKIE;
-  if (envCookies?.trim()) {
-    console.log("Loaded eBay cookies from EBAY_COOKIE env var");
-    return envCookies.trim();
-  }
-
-  // Priority 3: Cookie file (fallback)
-  try {
-    const file = Bun.file(cookiePath);
-    if (await file.exists()) {
-      const content = await file.text();
-      const trimmed = content.trim();
-      if (trimmed) {
-        console.log(`Loaded eBay cookies from ${cookiePath}`);
-        return trimmed;
-      }
-    }
-  } catch (e) {
-    console.warn(`Could not load cookies from ${cookiePath}: ${e}`);
-  }
-
-  // No cookies found (eBay cookies are optional, just warn)
+  if (cookies.length === 0) {
     console.warn(
       "No eBay cookies found. eBay may block requests without valid session cookies.\n" +
         "Provide cookies via (in priority order):\n" +
         "  1. 'cookies' URL parameter (highest priority), or\n" +
         "  2. EBAY_COOKIE environment variable, or\n" +
         "  3. ./cookies/ebay.json file (lowest priority)\n" +
-      'Format: Cookie string like "name1=value1; name2=value2"',
+        'Format: JSON array or cookie string like "name1=value1; name2=value2"',
     );
     return undefined;
   }
 
+  return formatCookiesForHeader(cookies, "www.ebay.ca");
+}
+
 // ----------------------------- Main -----------------------------
 
 export default async function fetchEbayItems(
@@ -384,8 +371,7 @@ export default async function fetchEbayItems(
     keywords?: string[];
     buyItNowOnly?: boolean;
     canadaOnly?: boolean;
-    cookies?: string; // Optional: Cookie string from URL parameter (highest priority)
-    cookiePath?: string; // Optional: Path to cookie file (default: ./cookies/ebay.json)
+    cookies?: string; // Optional: Cookie string or JSON (helps bypass bot detection)
   } = {},
 ) {
   const {
@@ -397,11 +383,10 @@ export default async function fetchEbayItems(
     buyItNowOnly = true,
     canadaOnly = true,
     cookies: cookiesSource,
-    cookiePath,
   } = opts;
 
   // Load eBay cookies with priority: URL param > ENV var > file
-  const cookies = await loadEbayCookies(cookiesSource, cookiePath);
+  const cookies = await loadEbayCookies(cookiesSource);
 
   // Build eBay search URL - use Canadian site, Buy It Now filter, and Canada-only preference
   const urlParams = new URLSearchParams({