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

src/lib/api.js

@@ -46,6 +46,12 @@ export const anthropicApi = {
           throw new Error(`API Error: ${response.status} ${response.statusText} - ${JSON.stringify(errData)}`);
         }
 
+        // Detect auth portal session expiry: the portal returns HTML instead of JSON
+        const contentType = response.headers.get('content-type') || '';
+        if (!contentType.includes('application/json')) {
+          throw new Error('Your session has expired. Please refresh the page and log in again.');
+        }
+
         const data = await response.json();
         return data.content[0].text;
       } catch (error) {