- Updated `load_instance` function to handle FileNotFoundError gracefully.
- Improved `Launcher` class to update UI elements with instance details after loading.
- Added new properties `image` and `news_feed` to the `Instance` class.
- Introduced JSON schema for instance configuration with new properties.
- Created default instance configuration for "LCE-Hub neoLegacy".
- Added scripts for downloading images and preparing packages.
- Implemented new image handling class for better image management.
- Updated versioning in `main.py` and `uv.lock` for release 0.26.4.11.
- Created a PowerShell script `clean.ps1` to remove build artifacts and temporary files.
- Added default instance configurations for "Default" and "Legacy Evolved" in JSON format.
- Introduced a guide in JSONC format detailing instance setup and configuration.
- Added an About dialog UI in XML format for the application.
- Included a license string for the GNU General Public License v3 in `license_str.py`.
- Introduced a new module `holyday.py` to manage and display holidays based on the current date.
- Implemented an enumeration for months and a dictionary for holiday messages.
- Created a new UI file `settingDialog.ui` for user settings, including language and theme selection.
- Added checkboxes for showing holidays and enabling developer mode in the settings dialog.
