feat(gui): Add minimize button to game window in windowed mode

[Caball009]

This PR adds the minimize button to the game window when the game is in windowed mode.

TODO:

• Replicate in Generals

[greptile-apps]

Greptile Summary

This PR makes a targeted one-line change to GeneralsMD/Code/Main/WinMain.cpp, adding WS_MINIMIZEBOX to the windowed-mode window style so the game window exposes a functional minimize button on its title bar. The companion task of applying the same fix to the base Generals game is acknowledged as a pending TODO.

Key changes:

• WS_MINIMIZEBOX is added alongside the existing WS_SYSMENU | WS_DLGFRAME | WS_CAPTION flags when runWindowed is true.
• The flags are reordered slightly (no functional impact — bitwise OR is commutative).
• Because WS_MAXIMIZEBOX is intentionally omitted, Windows will display a grayed-out (disabled) maximize button, which is the expected behavior for a fixed-resolution game window.
• The change is scoped only to windowed mode; the fullscreen branch is untouched.
• File header (GPL license, EA copyright, "Zero Hour" product name) is all correct for a GeneralsMD/ file per project conventions.

Confidence Score: 5/5

• This PR is safe to merge — the change is a single-line, well-understood Windows API flag addition with no side effects on game logic.
• The modification is minimal (one flag added to one OR expression), confined to windowed mode only, and uses a standard Win32 style bit that pairs correctly with the already-present WS_CAPTION and WS_SYSMENU. No new code paths, no resource management, no custom rules violated.
• No files require special attention.

Important Files Changed

Filename	Overview
GeneralsMD/Code/Main/WinMain.cpp	Adds WS_MINIMIZEBOX to the windowed-mode window style flags so users get a functional minimize button on the title bar; no other logic is touched.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[initializeAppWindows] --> B["windowStyle = WS_POPUP | WS_VISIBLE"]
    B --> C{runWindowed?}
    C -- Yes --> D["windowStyle |= WS_MINIMIZEBOX | WS_SYSMENU | WS_DLGFRAME | WS_CAPTION"]
    C -- No --> E["windowStyle |= WS_EX_TOPMOST | WS_SYSMENU"]
    D --> F[AdjustWindowRect]
    E --> F
    F --> G[CreateWindow with computed style]
    G --> H[Windowed window WITH minimize button]
    G --> H2[Fullscreen popup window]

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