OpenGL: Fix screenshot gray edge issue by correcting SetWindowPos usage

- OpenGLSwapChain::Initialize now uses AdjustWindowRect before SetWindowPos
- This ensures window client area matches expected size (1280x720)
- Previously SetWindowPos was given client area size instead of full window size
- Removed debug fprintf statements from OpenGLDevice
- Updated minimal integration test to use cleaner code

tests/RHI/OpenGL/integration/minimal/main.cpp

@@ -1,5 +1,7 @@
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
 
 #include <glad/glad.h>
 #include <windows.h>
@@ -35,7 +37,12 @@ void SaveScreenshotPPM(const char* filename, int width, int height) {
         return;
     }
 
+    glFinish();
+    glReadBuffer(GL_BACK);
     glPixelStorei(GL_PACK_ALIGNMENT, 1);
+    glPixelStorei(GL_PACK_ROW_LENGTH, 0);
+    glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
+    glPixelStorei(GL_PACK_SKIP_ROWS, 0);
     glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, pixels);
 
     FILE* f = fopen(filename, "wb");
@@ -101,23 +108,16 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
         NULL, NULL, hInstance, NULL
     );
 
-    RECT clientRect;
-    GetClientRect(hwnd, &clientRect);
-    fprintf(stderr, "[minimal] Window client area: %ldx%ld\n", clientRect.right, clientRect.bottom);
-
     if (!hwnd) {
         Log("[ERROR] Failed to create window");
         return -1;
     }
 
     OpenGLDevice device;
-    fprintf(stderr, "[minimal] About to call InitializeWithExistingWindow\n");
     if (!device.InitializeWithExistingWindow(hwnd)) {
-        fprintf(stderr, "[minimal] InitializeWithExistingWindow returned false\n");
         Log("[ERROR] Failed to initialize OpenGL device");
         return -1;
     }
-    fprintf(stderr, "[minimal] InitializeWithExistingWindow succeeded\n");
 
     ShowWindow(hwnd, nShowCmd);
     UpdateWindow(hwnd);
@@ -132,7 +132,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
     int frameCount = 0;
     const int targetFrameCount = 30;
 
-    while (true) {
+    while (frameCount < targetFrameCount) {
         if (PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE)) {
             if (msg.message == WM_QUIT) {
                 break;
@@ -145,19 +145,16 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
             glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
             swapChain.Present(0, 0);
             frameCount++;
-
-            if (frameCount >= targetFrameCount) {
-                Log("[INFO] Reached target frame count %d - taking screenshot!", targetFrameCount);
-                SaveScreenshotPPM("minimal.ppm", gWidth, gHeight);
-                break;
-            }
         }
     }
 
+    Log("[INFO] Reached target frame count %d - taking screenshot!", targetFrameCount);
+    SaveScreenshotPPM("minimal.ppm", gWidth, gHeight);
+
     swapChain.Shutdown();
     device.Shutdown();
     Logger::Get().Shutdown();
 
     Log("[INFO] OpenGL Integration Test Finished");
     return 0;
-}
+}