feat: DPI 인식 및 진행 막대 UI 추가

- SetProcessDpiAwarenessContext(PER_MONITOR_AWARE_V2)로 고DPI 디스플레이 지원
- GetDpiForSystem()으로 시스템 DPI 조회 후 모든 크기 동적 스케일링
- 다운로드 진행창에 msctls_progress32 진행 막대 추가 (0~100%)
- Segoe UI 9pt 폰트를 DPI에 맞게 CreateFontIndirectW로 생성
- 4K(200% / 192 DPI)와 FHD(100% / 96 DPI) 모두 동일한 시각적 크기 보장

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

main.go

@@ -32,15 +32,21 @@ const (
 const (
 	wmDestroy uint32 = 0x0002
 	wmClose   uint32 = 0x0010
+	wmSetFont uint32 = 0x0030
 	wmSetText uint32 = 0x000C
 	wmAppDone uint32 = 0x8001
 
 	wsPopup   uintptr = 0x80000000
 	wsCaption uintptr = 0x00C00000
+	wsSysMenu uintptr = 0x00080000
 	wsChild   uintptr = 0x40000000
 	wsVisible uintptr = 0x10000000
 	ssCenter  uintptr = 0x00000001
 
+	pbsSmooth     uintptr = 0x01
+	pbmSetRange32 uint32  = 0x0406
+	pbmSetPos     uint32  = 0x0402
+
 	swShow     = 5
 	smCxScreen = 0
 	smCyScreen = 1
@@ -51,12 +57,17 @@ const (
 	mbYesNo uintptr = 0x00000004
 	mbQ     uintptr = 0x00000020
 	idYes           = 6
+
+	iccProgressClass uint32 = 0x00000020
+	logpixelsX               = 88
 )
 
 var (
 	user32   = windows.NewLazySystemDLL("user32.dll")
 	kernel32 = windows.NewLazySystemDLL("kernel32.dll")
+	gdi32    = windows.NewLazySystemDLL("gdi32.dll")
 	shell32  = windows.NewLazySystemDLL("shell32.dll")
+	comctl32 = windows.NewLazySystemDLL("comctl32.dll")
 
 	messageBoxWProc                   = user32.NewProc("MessageBoxW")
 	registerClassExWProc              = user32.NewProc("RegisterClassExW")
@@ -72,11 +83,17 @@ var (
 	destroyWindowProc                 = user32.NewProc("DestroyWindow")
 	postQuitMsgProc                   = user32.NewProc("PostQuitMessage")
 	getSystemMetricsProc              = user32.NewProc("GetSystemMetrics")
+	getDpiForSystemProc               = user32.NewProc("GetDpiForSystem")
+	setProcessDpiAwarenessContextProc = user32.NewProc("SetProcessDpiAwarenessContext")
 	shellExecuteWProc                 = shell32.NewProc("ShellExecuteW")
 	getModuleHandleWProc              = kernel32.NewProc("GetModuleHandleW")
+	createFontIndirectWProc           = gdi32.NewProc("CreateFontIndirectW")
+	deleteObjectProc                  = gdi32.NewProc("DeleteObject")
+	initCommonControlsExProc          = comctl32.NewProc("InitCommonControlsEx")
 
 	wndProcCb         uintptr
 	progressLabelHwnd uintptr
+	progressBarHwnd   uintptr
 )
 
 type wndClassExW struct {
@@ -104,11 +121,78 @@ type msgW struct {
 	ptY     int32
 }
 
+type initCommonControlsExS struct {
+	dwSize uint32
+	dwICC  uint32
+}
+
+type logFontW struct {
+	lfHeight         int32
+	lfWidth          int32
+	lfEscapement     int32
+	lfOrientation    int32
+	lfWeight         int32
+	lfItalic         byte
+	lfUnderline      byte
+	lfStrikeOut      byte
+	lfCharSet        byte
+	lfOutPrecision   byte
+	lfClipPrecision  byte
+	lfQuality        byte
+	lfPitchAndFamily byte
+	lfFaceName       [32]uint16
+}
+
 func init() {
 	wndProcCb = syscall.NewCallback(progressWndProc)
 }
 
-// ── Win32 helpers ──────────────────────────────────────────────────────────
+// ── DPI helpers ──────────────────────────────────────────────────────────────
+
+func enableDPIAwareness() {
+	// DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 = -4 (Windows 10 1703+)
+	setProcessDpiAwarenessContextProc.Call(^uintptr(3))
+}
+
+func getSystemDPI() uint32 {
+	dpi, _, _ := getDpiForSystemProc.Call()
+	if dpi == 0 {
+		return 96
+	}
+	return uint32(dpi)
+}
+
+// dpiScale scales a base-96-DPI pixel value to the system DPI.
+func dpiScale(px int, dpi uint32) uintptr {
+	return uintptr(px * int(dpi) / 96)
+}
+
+// ── Font helpers ─────────────────────────────────────────────────────────────
+
+func createUIFont(pointSize int, dpi uint32) uintptr {
+	lf := logFontW{
+		lfHeight:  -int32(pointSize) * int32(dpi) / 72,
+		lfWeight:  400, // FW_NORMAL
+		lfCharSet: 1,   // DEFAULT_CHARSET
+		lfQuality: 5,   // CLEARTYPE_QUALITY
+	}
+	face, _ := windows.UTF16FromString("Segoe UI")
+	copy(lf.lfFaceName[:], face)
+	font, _, _ := createFontIndirectWProc.Call(uintptr(unsafe.Pointer(&lf)))
+	return font
+}
+
+// ── Common controls ──────────────────────────────────────────────────────────
+
+func initCommonControls() {
+	icc := initCommonControlsExS{
+		dwSize: uint32(unsafe.Sizeof(initCommonControlsExS{})),
+		dwICC:  iccProgressClass,
+	}
+	initCommonControlsExProc.Call(uintptr(unsafe.Pointer(&icc)))
+}
+
+// ── Win32 helpers ────────────────────────────────────────────────────────────
 
 func msgBox(title, text string, flags uintptr) int {
 	t, _ := windows.UTF16PtrFromString(title)
@@ -123,7 +207,7 @@ func openBrowser(rawURL string) {
 	shellExecuteWProc.Call(0, uintptr(unsafe.Pointer(op)), uintptr(unsafe.Pointer(u)), 0, 0, 1)
 }
 
-// ── Progress window ────────────────────────────────────────────────────────
+// ── Progress window ──────────────────────────────────────────────────────────
 
 func progressWndProc(hwnd, uMsg, wParam, lParam uintptr) uintptr {
 	switch uint32(uMsg) {
@@ -140,17 +224,26 @@ func progressWndProc(hwnd, uMsg, wParam, lParam uintptr) uintptr {
 	return ret
 }
 
-func setProgressText(text string) {
+func setProgress(text string, pct int) {
+	if text != "" {
 		t, _ := windows.UTF16PtrFromString(text)
 		sendMessageWProc.Call(progressLabelHwnd, uintptr(wmSetText), 0, uintptr(unsafe.Pointer(t)))
 	}
+	if pct >= 0 {
+		sendMessageWProc.Call(progressBarHwnd, uintptr(pbmSetPos), uintptr(pct), 0)
+	}
+}
 
-// downloadWithProgress shows a progress window and downloads+extracts the zip.
+// downloadWithProgress shows a DPI-aware progress window and downloads+extracts the zip.
 // Must be called from the main goroutine (Win32 message loop requirement).
 func downloadWithProgress(downloadURL, destDir string) error {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
+	initCommonControls()
+	dpi := getSystemDPI()
+	s := func(px int) uintptr { return dpiScale(px, dpi) }
+
 	hInstance, _, _ := getModuleHandleWProc.Call(0)
 
 	className, _ := windows.UTF16PtrFromString("A301Progress")
@@ -165,7 +258,8 @@ func downloadWithProgress(downloadURL, destDir string) error {
 
 	screenW, _, _ := getSystemMetricsProc.Call(smCxScreen)
 	screenH, _, _ := getSystemMetricsProc.Call(smCyScreen)
-	const winW, winH = 420, 110
+	winW := s(440)
+	winH := s(130)
 	x := (screenW - winW) / 2
 	y := (screenH - winH) / 2
 
@@ -174,11 +268,15 @@ func downloadWithProgress(downloadURL, destDir string) error {
 		0,
 		uintptr(unsafe.Pointer(className)),
 		uintptr(unsafe.Pointer(title)),
-		wsPopup|wsCaption|wsVisible,
+		wsPopup|wsCaption|wsSysMenu|wsVisible,
 		x, y, winW, winH,
 		0, 0, hInstance, 0,
 	)
 
+	font := createUIFont(9, dpi)
+	defer deleteObjectProc.Call(font)
+
+	// 상태 레이블 (텍스트)
 	staticClass, _ := windows.UTF16PtrFromString("STATIC")
 	initText, _ := windows.UTF16PtrFromString("게임 파일을 다운로드하는 중...")
 	progressLabelHwnd, _, _ = createWindowExWProc.Call(
@@ -186,9 +284,22 @@ func downloadWithProgress(downloadURL, destDir string) error {
 		uintptr(unsafe.Pointer(staticClass)),
 		uintptr(unsafe.Pointer(initText)),
 		wsChild|wsVisible|ssCenter,
-		10, 35, 400, 30,
+		s(16), s(20), winW-s(32), s(22),
 		hwnd, 0, hInstance, 0,
 	)
+	sendMessageWProc.Call(progressLabelHwnd, uintptr(wmSetFont), font, 1)
+
+	// 진행 막대
+	progressClass, _ := windows.UTF16PtrFromString("msctls_progress32")
+	progressBarHwnd, _, _ = createWindowExWProc.Call(
+		0,
+		uintptr(unsafe.Pointer(progressClass)),
+		0,
+		wsChild|wsVisible|pbsSmooth,
+		s(16), s(52), winW-s(32), s(22),
+		hwnd, 0, hInstance, 0,
+	)
+	sendMessageWProc.Call(progressBarHwnd, uintptr(pbmSetRange32), 0, 100)
 
 	showWindowProc.Call(hwnd, swShow)
 	updateWindowProc.Call(hwnd)
@@ -239,8 +350,8 @@ func doDownload(downloadURL, destDir string) error {
 			}
 			downloaded += int64(n)
 			if total > 0 {
-				pct := downloaded * 100 / total
+				pct := int(downloaded * 100 / total)
-				setProgressText(fmt.Sprintf("다운로드 중... %d%%", pct))
+				setProgress(fmt.Sprintf("다운로드 중... %d%%", pct), pct)
 			}
 		}
 		if err == io.EOF {
@@ -255,7 +366,7 @@ func doDownload(downloadURL, destDir string) error {
 	tmpFile.Close()
 	defer os.Remove(tmpPath)
 
-	setProgressText("압축을 해제하는 중...")
+	setProgress("압축을 해제하는 중...", -1)
 	return extractZip(tmpPath, destDir)
 }
 
@@ -317,7 +428,7 @@ func extractZip(zipPath, destDir string) error {
 	return nil
 }
 
-// ── Server info ────────────────────────────────────────────────────────────
+// ── Server info ──────────────────────────────────────────────────────────────
 
 type downloadInfo struct {
 	FileHash string `json:"fileHash"`
@@ -358,7 +469,7 @@ func hashFile(path string) (string, error) {
 	return hex.EncodeToString(h.Sum(nil)), nil
 }
 
-// ── Launcher path ──────────────────────────────────────────────────────────
+// ── Launcher path ────────────────────────────────────────────────────────────
 
 func launcherPath() (string, error) {
 	exe, err := os.Executable()
@@ -368,7 +479,7 @@ func launcherPath() (string, error) {
 	return filepath.Abs(exe)
 }
 
-// ── Protocol install / uninstall ───────────────────────────────────────────
+// ── Protocol install / uninstall ─────────────────────────────────────────────
 
 func install() error {
 	exePath, err := launcherPath()
@@ -407,7 +518,7 @@ func uninstall() error {
 	return nil
 }
 
-// ── Game update check + download ───────────────────────────────────────────
+// ── Game update check + download ─────────────────────────────────────────────
 
 func ensureGame(gameDir, gamePath string, serverInfo *downloadInfo) error {
 	needsDownload := false
@@ -436,7 +547,7 @@ func ensureGame(gameDir, gamePath string, serverInfo *downloadInfo) error {
 	return nil
 }
 
-// ── URI handler ────────────────────────────────────────────────────────────
+// ── URI handler ──────────────────────────────────────────────────────────────
 
 func handleURI(rawURI string) error {
 	parsed, err := url.Parse(rawURI)
@@ -473,9 +584,11 @@ func handleURI(rawURI string) error {
 	return nil
 }
 
-// ── Entry point ────────────────────────────────────────────────────────────
+// ── Entry point ──────────────────────────────────────────────────────────────
 
 func main() {
+	enableDPIAwareness()
+
 	if len(os.Args) < 2 {
 		ret := msgBox("A301 런처", "게임 실행을 위해 프로토콜을 등록합니다.\n계속하시겠습니까?", mbYesNo|mbQ)
 		if ret != idYes {