refactor(main): move remaining entry related code (#2127)

src/globals.cpp

@@ -0,0 +1,27 @@
+/**
+ * @file globals.cpp
+ * @brief Implementation for globally accessible variables and functions.
+ */
+#include "globals.h"
+
+/**
+ * @brief A process-wide communication mechanism.
+ */
+safe::mail_t mail::man;
+
+/**
+ * @brief A thread pool for processing tasks.
+ */
+thread_pool_util::ThreadPool task_pool;
+
+/**
+ * @brief A boolean flag to indicate whether the cursor should be displayed.
+ */
+bool display_cursor = true;
+
+#ifdef _WIN32
+/**
+ * @brief A global singleton used for NVIDIA control panel modifications.
+ */
+nvprefs::nvprefs_interface nvprefs_instance;
+#endif