Fix CI artifact upload path for WinUI MSIX build outputs

[Copilot]

CI packaging succeeded, but the artifact upload step failed because it searched Packages\ at repository root. The MSIX bundles are emitted under the project directory (AuraClick\Packages\), so no files were found by actions/upload-artifact.

• Root cause

  • Upload path in .github/workflows/ci.yml did not match the build output location for packaged artifacts.

• Workflow updates

  • Added Dir_Name: AuraClick to job env.
  • Updated upload path to compose project directory + package directory:
    • AuraClick\Packages\ via ${{ env.Dir_Name }}\${{ env.Appx_Package_Dir }}.

• Resulting behavior

  • Artifact collection now targets the same directory used by MSBuild package generation across matrix platforms.

env:
  Solution_Name: AuraClick.slnx
  Appx_Package_Dir: Packages\
  Dir_Name: AuraClick

# ...
with:
  path: ${{ env.Dir_Name }}\${{ env.Appx_Package_Dir }}