Add Store MSIX packaging and dark/light theme for 2.9.0.

EOF

Co-authored-by: Cursor <cursoragent@cursor.com>

tools/mkstoreassets/main.go

@@ -0,0 +1,96 @@
+// Generates Store / MSIX PNG assets from assets/navis-icon.png.
+package main
+
+import (
+	"fmt"
+	"image"
+	"image/color"
+	"image/png"
+	"os"
+	"path/filepath"
+
+	"golang.org/x/image/draw"
+)
+
+func main() {
+	in := filepath.Join("assets", "navis-icon.png")
+	outDir := filepath.Join("packaging", "msix", "Assets")
+	if len(os.Args) > 1 {
+		in = os.Args[1]
+	}
+	if len(os.Args) > 2 {
+		outDir = os.Args[2]
+	}
+	f, err := os.Open(in)
+	if err != nil {
+		fatal(err)
+	}
+	defer f.Close()
+	src, err := png.Decode(f)
+	if err != nil {
+		fatal(err)
+	}
+	if err := os.MkdirAll(outDir, 0o755); err != nil {
+		fatal(err)
+	}
+
+	square := map[string]int{
+		"StoreLogo.png":         50,
+		"Square44x44Logo.png":   44,
+		"Square71x71Logo.png":   71,
+		"Square150x150Logo.png": 150,
+		"Square310x310Logo.png": 310,
+	}
+	for name, size := range square {
+		if err := writePNG(filepath.Join(outDir, name), scaleContain(src, size, size, color.RGBA{12, 22, 19, 255})); err != nil {
+			fatal(err)
+		}
+	}
+	// Wide tile + splash: brand mark centered on deep forest panel.
+	if err := writePNG(filepath.Join(outDir, "Wide310x150Logo.png"), scaleContain(src, 310, 150, color.RGBA{12, 22, 19, 255})); err != nil {
+		fatal(err)
+	}
+	if err := writePNG(filepath.Join(outDir, "SplashScreen.png"), scaleContain(src, 620, 300, color.RGBA{12, 22, 19, 255})); err != nil {
+		fatal(err)
+	}
+	fmt.Println("Wrote Store assets to", outDir)
+}
+
+func scaleContain(src image.Image, w, h int, bg color.Color) image.Image {
+	dst := image.NewRGBA(image.Rect(0, 0, w, h))
+	draw.Draw(dst, dst.Bounds(), &image.Uniform{C: bg}, image.Point{}, draw.Src)
+	sb := src.Bounds()
+	sw, sh := sb.Dx(), sb.Dy()
+	scale := float64(w) / float64(sw)
+	if float64(h)/float64(sh) < scale {
+		scale = float64(h) / float64(sh)
+	}
+	// Keep icon smaller than full tile for padding.
+	scale *= 0.72
+	nw, nh := int(float64(sw)*scale), int(float64(sh)*scale)
+	if nw < 1 {
+		nw = 1
+	}
+	if nh < 1 {
+		nh = 1
+	}
+	x, y := (w-nw)/2, (h-nh)/2
+	resized := image.NewRGBA(image.Rect(0, 0, nw, nh))
+	draw.CatmullRom.Scale(resized, resized.Bounds(), src, sb, draw.Over, nil)
+	draw.Draw(dst, image.Rect(x, y, x+nw, y+nh), resized, image.Point{}, draw.Over)
+	return dst
+}
+
+func writePNG(path string, img image.Image) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	return png.Encode(f, img)
+}
+
+func fatal(err error) {
+	fmt.Fprintln(os.Stderr, err)
+	os.Exit(1)
+}