feat(desktop): add native Windows window controller

desktopApp/src/test/kotlin/com/vnidrop/app/DesktopWindowChromeTest.kt

@@ -1,8 +1,12 @@
 package com.vnidrop.app
 
+import androidx.compose.ui.geometry.Rect
 import androidx.compose.ui.window.WindowPlacement
 import kotlin.test.Test
 import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+import org.jetbrains.skiko.GraphicsApi
 
 class DesktopWindowChromeTest {
 	@Test
@@ -34,4 +38,114 @@ class DesktopWindowChromeTest {
 			linuxWindowControlVisualState(isClose = false, isHovered = false, isPressed = false),
 		)
 	}
+
+	@Test
+	fun windowsHitTestingPreservesNativeResizeAndCaptionBehavior() {
+		val geometry = windowsGeometry()
+
+		assertEquals(WindowsHitTestResult.TopLeft, windowsHitTest(2, 2, geometry))
+		assertEquals(WindowsHitTestResult.Right, windowsHitTest(1_198, 300, geometry))
+		assertEquals(WindowsHitTestResult.Bottom, windowsHitTest(600, 798, geometry))
+		assertEquals(WindowsHitTestResult.Caption, windowsHitTest(600, 24, geometry))
+		assertEquals(WindowsHitTestResult.Client, windowsHitTest(600, 200, geometry))
+	}
+
+	@Test
+	fun windowsCaptionButtonsReturnNativeHitCodesForSnapLayouts() {
+		val geometry = windowsGeometry()
+
+		assertEquals(WindowsHitTestResult.MinimizeButton, windowsHitTest(1_075, 20, geometry))
+		assertEquals(WindowsHitTestResult.MaximizeButton, windowsHitTest(1_120, 20, geometry))
+		assertEquals(WindowsHitTestResult.CloseButton, windowsHitTest(1_175, 20, geometry))
+	}
+
+	@Test
+	fun nativeCaptionStripIsSplitIntoThreeAdjacentButtons() {
+		val bounds = splitWindowsCaptionButtonBounds(Rect(646f, 0f, 793f, 30f))
+
+		assertEquals(Rect(646f, 0f, 695f, 30f), bounds.minimize)
+		assertEquals(Rect(695f, 0f, 744f, 30f), bounds.maximize)
+		assertEquals(Rect(744f, 0f, 793f, 30f), bounds.close)
+	}
+
+	@Test
+	fun extendedDwmTitleBarMarginScalesWithWindowDpi() {
+		assertEquals(48, windowsTitleBarHeightPixels(96))
+		assertEquals(60, windowsTitleBarHeightPixels(120))
+		assertEquals(72, windowsTitleBarHeightPixels(144))
+	}
+
+	@Test
+	fun maximizedWindowsDoNotExposeResizeBorders() {
+		val geometry = windowsGeometry().copy(isMaximized = true)
+
+		assertEquals(WindowsHitTestResult.Caption, windowsHitTest(2, 2, geometry))
+	}
+
+	@Test
+	fun restoredWindowsPaintThroughTheResizeBorderWhileMaximizedWindowsStayInset() {
+		assertEquals(
+			WindowsFrameInsets(),
+			windowsContentInsets(
+				isMaximized = false,
+				horizontalResizeBorder = 8,
+				verticalResizeBorder = 8,
+			),
+		)
+		assertEquals(
+			WindowsFrameInsets(left = 8, top = 9, right = 8, bottom = 9),
+			windowsContentInsets(
+				isMaximized = true,
+				horizontalResizeBorder = 8,
+				verticalResizeBorder = 9,
+			),
+		)
+	}
+
+	@Test
+	fun nativeMouseCoordinatesPreserveNegativeMonitorPositions() {
+		val x = -320
+		val y = -48
+		val packed = ((y and 0xffff).toLong() shl 16) or (x and 0xffff).toLong()
+
+		assertEquals(WindowsScreenPoint(x, y), windowsScreenPoint(packed))
+	}
+
+	@Test
+	fun nativeBackdropRequiresAGpuRendererWithTransparentSwapChainSupport() {
+		assertTrue(GraphicsApi.DIRECT3D.supportsWindowsTransparentBackground())
+		assertTrue(GraphicsApi.OPENGL.supportsWindowsTransparentBackground())
+		assertFalse(GraphicsApi.UNKNOWN.supportsWindowsTransparentBackground())
+		assertFalse(GraphicsApi.SOFTWARE_FAST.supportsWindowsTransparentBackground())
+		assertFalse(GraphicsApi.SOFTWARE_COMPAT.supportsWindowsTransparentBackground())
+	}
+
+	@Test
+	fun captionActionRequiresReleaseOnTheOriginallyPressedButton() {
+		assertTrue(
+			shouldActivateWindowsCaptionButton(
+				WindowsCaptionButton.Maximize,
+				WindowsCaptionButton.Maximize,
+			),
+		)
+		assertFalse(
+			shouldActivateWindowsCaptionButton(
+				WindowsCaptionButton.Close,
+				WindowsCaptionButton.Maximize,
+			),
+		)
+		assertFalse(shouldActivateWindowsCaptionButton(WindowsCaptionButton.Close, null))
+	}
+
+	private fun windowsGeometry() = WindowsHitTestGeometry(
+		width = 1_200,
+		height = 800,
+		horizontalResizeBorder = 8,
+		verticalResizeBorder = 8,
+		isMaximized = false,
+		caption = Rect(0f, 0f, 1_200f, 48f),
+		minimizeButton = Rect(1_062f, 8f, 1_108f, 40f),
+		maximizeButton = Rect(1_108f, 8f, 1_154f, 40f),
+		closeButton = Rect(1_154f, 8f, 1_200f, 40f),
+	)
 }