### Added
- Linux MinGW-w64 cross-build support in `build_plugin.py` via `--host linux`
- `tools/linux/build_plugin_linux.py` for standalone Linux builds
- Color output and progress spinner in all legacy build scripts

### Changed
- `build_plugin.py` now supports both Windows (MSBuild) and Linux (MinGW-w64) targets
- Windows build-script f-string fixes

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