LazyRun v1.0.0: shortcut maker untuk executable dan PWA

- Fungsi A: shortcut dari file executable (ELF/AppImage/script)
- Fungsi B: shortcut PWA/URL dengan deteksi browser (native, /opt, Flatpak)
- Checkbox Menu Aplikasi / Desktop, desktop-only pakai NoDisplay=true
- List + uninstall + deteksi shortcut yang file .desktop-nya hilang
- Metadata ~/.config/lazyrun/shortcuts.json, refresh cache XDG/KDE
- AppImage + zsync update info via build.sh

internal/xdg/xdg_test.go

@@ -0,0 +1,39 @@
+package xdg
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestDataHomeOverride(t *testing.T) {
+	t.Setenv("HOME", "/home/tester")
+	t.Setenv("XDG_DATA_HOME", "/data")
+	if got := ApplicationsDir(); got != "/data/applications" {
+		t.Errorf("ApplicationsDir() = %s", got)
+	}
+	if got := IconsDir(); got != filepath.Join("/data", "icons/hicolor/512x512/apps") {
+		t.Errorf("IconsDir() = %s", got)
+	}
+}
+
+func TestFallbacks(t *testing.T) {
+	t.Setenv("HOME", "/home/tester")
+	t.Setenv("XDG_DATA_HOME", "")
+	t.Setenv("XDG_CONFIG_HOME", "")
+
+	if got := ApplicationsDir(); got != "/home/tester/.local/share/applications" {
+		t.Errorf("ApplicationsDir() = %s", got)
+	}
+	if got := BinDir(); got != "/home/tester/.local/bin" {
+		t.Errorf("BinDir() = %s", got)
+	}
+	if got := MetadataPath(); got != "/home/tester/.config/lazyrun/shortcuts.json" {
+		t.Errorf("MetadataPath() = %s", got)
+	}
+
+	// xdg-user-dir tidak ada di $PATH → fallback ke ~/Desktop.
+	t.Setenv("PATH", "")
+	if got := DesktopDir(); got != "/home/tester/Desktop" {
+		t.Errorf("DesktopDir() = %s", got)
+	}
+}