refactor: use ComPtr more and clean up DCompPresenter

[Aurumaker72]

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[Copilot]

Pull request overview

Refactors the Win32 Lua presenters to rely more consistently on Microsoft::WRL::ComPtr for COM lifetime management, and removes the old shared DirectComposition context helper from ViewHelpers.h as part of cleaning up DCompPresenter.

Changes:

• Removed the old CompositionContext / create_composition_context() helper from ViewHelpers.h and inlined ownership into DCompPresenter.
• Converted GDIPresenter and DCompPresenter COM members to ComPtr and removed manual Release() calls.
• Introduced a global ComPtr alias via stdafx.h and removed a redundant local alias in MGECompositor.cpp.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/Views.Win32/ViewHelpers.h	Removes the old DirectComposition helper context struct/function.
src/Views.Win32/stdafx.h	Adds a global ComPtr alias for Views.Win32 compilation units.
src/Views.Win32/lua/presenters/GDIPresenter.h	Switches D2D members to ComPtr.
src/Views.Win32/lua/presenters/GDIPresenter.cpp	Removes manual COM releases; updates ComPtr usage.
src/Views.Win32/lua/presenters/DCompPresenter.h	Replaces CompositionContext with explicit ComPtr members + helper method.
src/Views.Win32/lua/presenters/DCompPresenter.cpp	Reworks initialization/resize/present paths to use ComPtr fields.
src/Views.Win32/components/MGECompositor.cpp	Drops now-redundant using Microsoft::WRL::ComPtr;.

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