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/icon/favicon_test.go

@@ -0,0 +1,112 @@
+package icon
+
+import (
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func icoWithPNG(png []byte) []byte {
+	ico := make([]byte, 22+len(png))
+	ico[2], ico[3] = 1, 0 // type = icon
+	ico[4], ico[5] = 1, 0 // jumlah gambar
+	put32 := func(off, v int) {
+		ico[off] = byte(v)
+		ico[off+1] = byte(v >> 8)
+		ico[off+2] = byte(v >> 16)
+		ico[off+3] = byte(v >> 24)
+	}
+	put32(14, len(png)) // bytesInRes
+	put32(18, 22)       // imageOffset
+	copy(ico[22:], png)
+	return ico
+}
+
+var png = append([]byte("\x89PNG\r\n\x1a\n"), []byte("payload")...)
+
+func TestFetchUsesLinkedIcon(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/":
+			io.WriteString(w, `<html><head>`+
+				`<link rel="apple-touch-icon" href="/small.ico">`+
+				`<link rel="icon" type="image/png" sizes="192x192" href="/big.png">`+
+				`</head></html>`)
+		case "/big.png":
+			w.Write(png)
+		default:
+			w.Write(icoWithPNG(png))
+		}
+	}))
+	defer srv.Close()
+
+	data, ext, err := Fetch(srv.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if ext != ".png" || string(data) != string(png) {
+		t.Errorf("ikon terpilih salah: ext=%s data=%q", ext, data)
+	}
+}
+
+func TestFetchFallsBackToFaviconICO(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/" {
+			io.WriteString(w, `<html><head><title>no icon</title></head></html>`)
+			return
+		}
+		w.Write(icoWithPNG(png))
+	}))
+	defer srv.Close()
+
+	data, ext, err := Fetch(srv.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if ext != ".png" || string(data) != string(png) {
+		t.Errorf("PNG di dalam .ico harus dipakai: ext=%s data=%q", ext, data)
+	}
+}
+
+func TestFetchFailsWithoutIcon(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	if _, _, err := Fetch(srv.URL); err == nil {
+		t.Error("tanpa favicon harus error supaya UI pakai ikon default")
+	}
+}
+
+func TestLargestPNGFromICO(t *testing.T) {
+	if got := largestPNGFromICO(icoWithPNG(png)); string(got) != string(png) {
+		t.Errorf("PNG di dalam .ico tidak terbaca: %q", got)
+	}
+	if got := largestPNGFromICO([]byte("bukan ico")); got != nil {
+		t.Errorf("data bukan ICO harus menghasilkan nil, dapat %q", got)
+	}
+	// ICO berisi BMP lama (bukan PNG) tidak didukung.
+	bmp := make([]byte, 40)
+	bmp[0], bmp[1], bmp[2], bmp[3] = 0, 0, 1, 0
+	bmp[4], bmp[5] = 1, 0
+	if got := largestPNGFromICO(bmp); got != nil {
+		t.Errorf("ICO BMP harus mengembalikan nil, dapat %q", got)
+	}
+}
+
+func TestSniffExt(t *testing.T) {
+	if ext := sniffExt(png); ext != ".png" {
+		t.Errorf("sniffExt(png) = %s", ext)
+	}
+	if ext := sniffExt([]byte(`<?xml version="1.0"?><svg xmlns="..."><path/></svg>`)); ext != ".svg" {
+		t.Errorf("sniffExt(svg) = %s", ext)
+	}
+	if ext := sniffExt([]byte("\xff\xd8\xff\xe0jpeg")); ext != ".jpg" {
+		t.Errorf("sniffExt(jpg) = %s", ext)
+	}
+	if ext := sniffExt([]byte("plain text")); ext != "" {
+		t.Errorf("sniffExt(text) = %s", ext)
+	}
+}