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

* Nix: add hyprland-qtutils to PATH

* flake.lock: update

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

src/helpers/MiscFunctions.hpp

@@ -42,6 +42,7 @@ bool                                envEnabled(const std::string& env);
 int                                 allocateSHMFile(size_t len);
 bool                                allocateSHMFilePair(size_t size, int* rw_fd_ptr, int* ro_fd_ptr);
 float                               stringToPercentage(const std::string& VALUE, const float REL);
+bool                                executableExistsInPath(const std::string& exe);
 
 template <typename... Args>
 [[deprecated("use std::format instead")]] std::string getFormat(std::format_string<Args...> fmt, Args&&... args) {