Separate video presentation from Win32 window details

[Krisztiaan]

Summary

Pass native window handles, drawable size, and refresh rate into the video layer instead of querying Win32 there. This preserves current behavior while creating a narrow boundary for future platform implementations.

Behavior and compatibility

Preserved behavior, no observable operational change should be user visible. Boundaries moved.

Validation

• git diff --check 59fae722af8c77f213cd58c799cb92ab6c85b98b — passed
• Visual Studio 2022 Win32 Debug and Release — not run locally 🍏 for now; CI will run both
• tested CI built output via wine on macOS

Documentation

Does not change anything noteworthy yet.

Checklist

• The change is focused; unrelated mechanical cleanup is separate
• Compatibility effects and any migration are explicit
• Validation distinguishes what passed, failed, and was not run
• No prohibited assets, binaries, SDKs, credentials, or generated output are included

[github-actions]

Development builds of a7ed70f:

• opents-Release-a279fb6
• opents-Debug-a279fb6

The links work without a GitHub account. Artifacts expire after 90 days, and this comment follows the latest successful build.