Version 6.4.5 for BS 1.40.8

[hardcpp]

Changes

• Fix race conditions around MonoPtr<>
• Improve thread safety and object lifetime handling across networking, services, pools, animations, textures, and main-thread invokers.
• Fix a race condition in UserPlatform and add main-thread detection.
• Improve level lookup, caching, metadata loading, and failure handling.
• Prevent UI conflicts with other mods by using the game HMUI screen system.
• Migrate the loading progress overlay to the SDK UI system.
• Refresh button, slider, dropdown, text-input, and segmented-control styling.
• Add silent dropdown option updates.
• Add seasonal event theming with a settings toggle.
• Move utility scripts into scripts/ and add Bash equivalents.
• Update the Android NDK, QPM tooling, workflows, and dependencies.
• Bump the package version from 6.4.1 to 6.4.5.

API notes

• CDropdown::SetOptions now accepts an optional notification flag.
• Level lookup helpers now support silent failures.
• StartBeatmapLevel now supports a color override type.
• LevelDetail gains reset and basic game-level loading support.
• HMUIUIUtils exposes the game screen system.