feat(platform): add Reinstall helpers to Pacman and Yay

internal/platform/aur.go

@@ -52,6 +52,17 @@ func (y *Yay) Install(ctx context.Context, pkgs []string) error {
 	return y.Runner.Run(ctx, "yay", args...)
 }
 
+// Reinstall runs `yay -S --noconfirm <pkgs...>` WITHOUT `--needed`, forcing
+// yay/pacman to re-fetch and reinstall the packages even if already present.
+// Used by the `--force` flag to bypass idempotency.
+func (y *Yay) Reinstall(ctx context.Context, pkgs []string) error {
+	if len(pkgs) == 0 {
+		return nil
+	}
+	args := append([]string{"-S", "--noconfirm"}, pkgs...)
+	return y.Runner.Run(ctx, "yay", args...)
+}
+
 func shellQuote(s string) string {
 	return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
 }