feat: implement Anthropic API client with simulation support and add PocketBase configuration with session expiry handling

src/lib/pb.js

@@ -4,3 +4,13 @@ const pbUrl = import.meta.env.VITE_PB_URL ||
   (typeof window !== 'undefined' ? window.location.origin : 'http://localhost:8090');
 
 export const pb = new PocketBase(pbUrl);
+
+// Detect auth portal session expiry: the portal returns HTML instead of JSON.
+// This prevents cryptic "Unexpected token '<'" errors when the session expires.
+pb.afterSend = function (response, data) {
+  const contentType = response.headers.get('content-type') || '';
+  if (contentType.includes('text/html')) {
+    throw new Error('Your session has expired. Please refresh the page and log in again.');
+  }
+  return data;
+};