Fix layout icone en-tete: redimensionnement 24x24 avant affichage

Changements :
- Redimensionnement de l'icone PNG a 24x24 via CatmullRom (golang.org/x/image/draw)
- Corrige le decalage de l'interface cause par l'image 912x1164

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

go.mod

@@ -1,9 +1,10 @@
 module gitchecker
 
-go 1.22
+go 1.25.0
 
 require (
 	github.com/lxn/walk v0.0.0-20210112085537-c389da54e794
+	golang.org/x/image v0.38.0
 	golang.org/x/sys v0.18.0
 )
 

go.sum

@@ -2,6 +2,8 @@ github.com/lxn/walk v0.0.0-20210112085537-c389da54e794 h1:NVRJ0Uy0SOFcXSKLsS65Om
 github.com/lxn/walk v0.0.0-20210112085537-c389da54e794/go.mod h1:E23UucZGqpuUANJooIbHWCufXvOcT6E7Stq81gU+CSQ=
 github.com/lxn/win v0.0.0-20210218163916-a377121e959e h1:H+t6A/QJMbhCSEH5rAuRxh+CtW96g0Or0Fxa9IKr4uc=
 github.com/lxn/win v0.0.0-20210218163916-a377121e959e/go.mod h1:KxxjdtRkfNoYDCUP5ryK7XJJNTnpC8atvtmTheChOtk=
+golang.org/x/image v0.38.0 h1:5l+q+Y9JDC7mBOMjo4/aPhMDcxEptsX+Tt3GgRQRPuE=
+golang.org/x/image v0.38.0/go.mod h1:/3f6vaXC+6CEanU4KJxbcUZyEePbyKbaLoDOe4ehFYY=
 golang.org/x/sys v0.0.0-20201018230417-eeed37f84f13/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
 golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

gui.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	_ "embed"
 	"fmt"
+	"image"
 	"image/png"
 	"os"
 	"os/exec"
@@ -15,6 +16,7 @@ import (
 
 	"github.com/lxn/walk"
 	. "github.com/lxn/walk/declarative"
+	xdraw "golang.org/x/image/draw"
 )
 
 //go:embed icon.png
@@ -253,7 +255,7 @@ func (a *App) buildAndRun() error {
 						AssignTo: &a.iconView,
 						MinSize:  Size{Width: 24, Height: 24},
 						MaxSize:  Size{Width: 24, Height: 24},
-						Mode:     ImageViewModeShrink,
+						Mode:     ImageViewModeIdeal,
 					},
 					Label{
 						Text: "Git Update Checker v" + VERSION,
@@ -342,11 +344,14 @@ func (a *App) buildAndRun() error {
 		}
 	}
 
-	// Icône dans l'en-tête (depuis PNG embarqué dans l'exe)
+	// Icône dans l'en-tête (depuis PNG embarqué dans l'exe, redimensionné 24x24)
 	if img, err := png.Decode(bytes.NewReader(iconPNG)); err != nil {
 		logWarn("Icône PNG: décodage échoué: " + err.Error())
 	} else {
-		bmp, err := walk.NewBitmapFromImageForDPI(img, 96)
+		const iconSize = 24
+		dst := image.NewRGBA(image.Rect(0, 0, iconSize, iconSize))
+		xdraw.CatmullRom.Scale(dst, dst.Bounds(), img, img.Bounds(), xdraw.Over, nil)
+		bmp, err := walk.NewBitmapFromImageForDPI(dst, 96)
 		if err != nil {
 			logWarn("Icône PNG: bitmap échoué: " + err.Error())
 		} else {