feat(installer): Add dark mode support in setup_windows.iss

RC Chuahrequested to merge
rc-chuah/cli:feat/add-dark-mode-support-in-inno-setup-installer into main

Description

Added dark mode support in setup_windows.iss for the GitLab CLI installer.

Key changes:

  • Enabled dark mode styling in Inno Setup script.
  • Updated wizard theme configuration.

Related Issues

Resolves #8134 (closed)

How has this been tested?

  • Tested installer on Windows 10 and Windows 11.
  • Tested installer on older Windows versions for backward compatibility.
  • Verified dark mode UI elements render correctly.
  • Ensured no regressions in light mode.
Edited by RC Chuah

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