* feat: improve save/load interface with custom names and metadata
- Add custom save name support with input validation
- Extend save metadata with avatar counts, protagonist info, and event count
- Add quick save button alongside named save option
- Enhance save list display with richer information
- Add sanitize_save_name and find_protagonist_name helpers
- Update API endpoints to support new features
- Add i18n translations for new UI elements
Closes#95
* test: add comprehensive tests for save custom name feature
- Add 37 tests for sanitize_save_name, find_protagonist_name
- Add tests for custom name API endpoints
- Add tests for enhanced metadata
- Fix unused NIcon import in SaveLoadPanel
- Add zh-TW translations for new save_load keys
* test(frontend): add SaveLoadPanel component tests
- Add 21 tests for SaveLoadPanel component
- Cover save mode, load mode, display, validation
- Mock naive-ui components, stores, and API
- Updated `HiddenDomainInfo` interface to include `cd_years` and `open_prob` properties for better domain management.
- Modified `serialize_active_domains` function to serialize new properties.
- Enhanced `StatusWidget` to display additional information about hidden domains, including cooldown years and open probability.
- Updated localization files for English and Chinese to reflect new status labels for hidden domains.
- Updated `serialize_active_domains` to include both active and inactive hidden domains, adding an `is_open` property for each domain.
- Modified `StatusBar` and `StatusWidget` components to reflect the new domain state, displaying appropriate labels and colors based on the activation status.
- Adjusted localization files for English and Chinese to align with the updated hidden domain features.
- Implemented `serialize_active_domains` function to gather and format active hidden domains from the game world.
- Updated `game_loop` to include active domains in the broadcast state.
- Enhanced `StatusBar` component to display active domains with a new `StatusWidget`, including dynamic labels and colors based on the number of active domains.
- Added localization support for hidden domain messages in both English and Chinese.
- Updated the world store to manage active domains state and synchronize with the backend.
