- Add "Fetch All" button alongside "Load More" to continuously SCAN until all keys loaded
- Add stop button and scan progress display during fetch-all
- Implement mergeKeysIntoRedisKeyTree for incremental namespace tree building
- Add toast notifications for empty form validation in key detail panel
- Add i18n translations for new UI elements (zh-CN, zh-TW, en, es)
- Add unit tests for incremental tree merge covering 6 scenarios