Update CI: migrate to Clang 19.1.0, fix typo, enable manual workflow trigger

[FreeDurok]

Summary

This PR introduces three improvements to the build system and codebase:

1. Upgrade LLVM/Clang
   Migrated from Clang 18.1.0 to Clang 19.1.0 to resolve CI build failures.
2. Typo fix
   Corrected a typo in the arguments menu for better clarity.
3. Workflow enhancements
   Added the workflow_dispatch event to the GitHub Actions configuration, enabling manual runs from the Actions UI.

Rationale

• Clang 18.1.0 was causing build errors in the CI pipeline (see failed build log).
• Improves user-facing text consistency.
• Facilitates testing and debugging by allowing manual workflow execution.
• Fixes #13

Testing

• Verified successful builds with Clang 19.1.0 on Windows runners (see successful build log)..
• Manually triggered the workflow from the Actions UI to ensure correct behavior.