core: Add support for hyprqtutils' update screen (#8651)

* Nix: add hyprland-qtutils to PATH

* flake.lock: update

---------

Co-authored-by: Mihai Fufezan <mihai@fufexan.net>

src/managers/VersionKeeperManager.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <memory>
+#include <optional>
+
+class CVersionKeeperManager {
+  public:
+    CVersionKeeperManager();
+
+  private:
+    std::optional<std::string> getDataHome();
+    std::optional<std::string> getDataLastVersion(const std::string& dataRoot);
+    void                       writeVersionToVersionFile(const std::string& dataRoot);
+    bool                       isVersionOlderThanRunning(const std::string& ver);
+};
+
+inline std::unique_ptr<CVersionKeeperManager> g_pVersionKeeperMgr;