Update workflow: screenshots go to screenshots/ dir

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/rules/agent-workflow.mdc

@@ -25,7 +25,7 @@ For every task, follow this sequence:
 After ANY visual change:
 1. Ensure dev server is running (`npm run dev`)
 2. Navigate to `http://localhost:5173`
-3. Take screenshot to see result
+3. Take screenshot to `screenshots/` folder (gitignored)
 4. Check browser console for errors
 5. Fix issues before committing