v1.3: Faster UI, Cleaner Chat, and More Reliable Startup

This release improves the Windows installation workflow and enhances overall performance.

Themes now follow the theme selected in IDA instead of using a hardcoded dark mode, which also fixes several crashes on Windows. It also includes broader performance and algorithm improvements for a smoother overall experience.

Changelog:

• Improved chat and UI responsiveness, with lower restore/render overhead and bulk renamer/markdown performance work.
• Restored host-native theming and chat card styling, plus removed Qt shim-dependent UI usage.
• Hardened bootstrap/auth-cache initialization by lazy-loading dependencies and improving early logging behavior.
• Fixed installer detection for IDA’s bundled Python, reducing setup failures in host environments.
• Tightened Qt compatibility and test stubs to better match runtime behavior.
• Fixed order-dependent test failures and cleaned up gate/lint issues.
• Cleaned up deprecated agent markdown docs while restoring files that were removed accidentally.
• Bumped plugin/tag metadata for the v1.3 release.