UI: tombol GitHub + Donasi, tombol Open per shortcut, aksen gradien

- Footer: Check for Updates, GitHub (github.com/oxpoe/lazyrun), Donate (donasi.oxpoe.qzz.io)
- Baris shortcut: tombol play untuk menjalankan (pakai exec_args hasil install)
- metadata shortcut menyimpan exec_args; ada fallback ke binary/URL untuk data lama
- Chip jumlah shortcut di header daftar + garis gradien brand di bawah header
- README: link repo & donasi absolut

internal/ui/links.go

@@ -0,0 +1,51 @@
+package ui
+
+import (
+	"net/url"
+	"os/exec"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/dialog"
+
+	"lazyrun/internal/store"
+)
+
+// Link aplikasi: repo GitHub LazyRun dan halaman donasi.
+const (
+	repoURL   = "https://github.com/oxpoe/lazyrun"
+	donateURL = "https://donasi.oxpoe.qzz.io/"
+)
+
+// openURL membuka link di browser default.
+func (ui *app) openURL(raw string) {
+	u, err := url.Parse(raw)
+	if err == nil {
+		err = fyne.CurrentApp().OpenURL(u)
+	}
+	if err != nil {
+		dialog.ShowError(err, ui.win)
+	}
+}
+
+// launch menjalankan shortcut: pakai argv hasil install, fallback ke binary/URL.
+func (ui *app) launch(sc store.Shortcut) {
+	args := sc.ExecArgs
+	if len(args) == 0 {
+		switch {
+		case sc.Type == store.TypeWebApp && sc.URL != "":
+			args = []string{"xdg-open", sc.URL}
+		case sc.BinaryPath != "":
+			args = []string{sc.BinaryPath}
+		}
+	}
+	if len(args) == 0 {
+		return
+	}
+
+	cmd := exec.Command(args[0], args[1:]...)
+	if err := cmd.Start(); err != nil {
+		dialog.ShowError(err, ui.win)
+		return
+	}
+	go cmd.Wait() // supaya proses anak tidak jadi zombie
+}