fix not working in systemd injection

internal/injection/clipboard.go

@@ -3,6 +3,7 @@ package injection
 import (
 	"context"
 	"fmt"
+	"os"
 	"os/exec"
 	"strings"
 	"time"
@@ -44,5 +45,14 @@ func checkClipboardAvailable() error {
 		return fmt.Errorf("wl-paste not found: %w (install wl-clipboard)", err)
 	}
 
+	// Check for Wayland environment
+	if os.Getenv("WAYLAND_DISPLAY") == "" {
+		return fmt.Errorf("WAYLAND_DISPLAY not set - clipboard operations require Wayland session")
+	}
+
+	if os.Getenv("XDG_RUNTIME_DIR") == "" {
+		return fmt.Errorf("XDG_RUNTIME_DIR not set - clipboard operations require proper session environment")
+	}
+
 	return nil
 }