Fix GUI instance counts and launcher tmp paths

internal/common/project_paths.go

@@ -0,0 +1,16 @@
+package common
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func RuntimeBaseDir() string {
+	exe, err := os.Executable()
+	if err == nil {
+		return filepath.Dir(exe)
+	}
+	return "."
+}
+
+func RootDir() string { return RuntimeBaseDir() }