Initial Das OS 0.1.0: Void Linux live ISO with Xfce

- xbps-src templates: das-theme (adw-gtk3-based GTK themes, generated
  xfwm4 frames, wallpapers, logo), das-settings (Xfce, panel, LightDM
  defaults in /etc/xdg/das), adw-gtk3 and font-jetbrains-mono
- void-mklive profile in live/: packages, runit services, rootfs overlay,
  Ukrainian locale, live user with autologin
- Void builder container, build scripts, QEMU runner and Makefile
- Bilingual README with screenshots

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

srcpkgs/das-theme/files/xfwm4gen/main_test.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// xfwm4 falls back to an ugly built-in frame when any of these slices is missing.
+var requiredSlices = []string{
+	"top-left", "top-right", "left", "right", "bottom", "bottom-left", "bottom-right",
+	"title-1", "title-2", "title-3", "title-4", "title-5",
+}
+
+var requiredButtons = []string{
+	"close", "hide", "maximize", "maximize-toggled", "menu",
+	"shade", "shade-toggled", "stick", "stick-toggled",
+}
+
+func TestGenerateWritesCompleteTheme(t *testing.T) {
+	for name, v := range variants {
+		t.Run(name, func(t *testing.T) {
+			dir := t.TempDir()
+			if err := generate(v, dir); err != nil {
+				t.Fatal(err)
+			}
+			want := []string{"themerc"}
+			for _, s := range requiredSlices {
+				want = append(want, s+"-active.png", s+"-inactive.png")
+			}
+			for _, b := range requiredButtons {
+				for _, state := range []string{"active", "inactive", "prelight", "pressed"} {
+					want = append(want, b+"-"+state+".png")
+				}
+			}
+			for _, f := range want {
+				if _, err := os.Stat(filepath.Join(dir, f)); err != nil {
+					t.Errorf("missing %s", f)
+				}
+			}
+		})
+	}
+}
+
+func TestTopLeftCornerIsTransparentOutsideRadius(t *testing.T) {
+	img := render(cornerWidth, titleHeight, topLeft(variants["light"].active))
+	if a := img.NRGBAAt(0, 0).A; a != 0 {
+		t.Errorf("corner pixel alpha = %d, want 0", a)
+	}
+	if a := img.NRGBAAt(cornerWidth-1, titleHeight/2).A; a != 0xff {
+		t.Errorf("title pixel alpha = %d, want 255", a)
+	}
+}
+
+func TestButtonsMatchTitleHeight(t *testing.T) {
+	for _, p := range pieces(variants["dark"]) {
+		if p.w == buttonWidth && p.h != titleHeight {
+			t.Errorf("%s height = %d, want %d", p.name, p.h, titleHeight)
+		}
+	}
+}