dail8859/NotepadNext ? reverse-engineered prompt

Build me a cross platform desktop text editor that feels like a modern Notepad++ alternative. I want it to run on Windows, Linux, and macOS as a real native app, using C++ and Qt 6.

The main goal is a clean editor where I can open, edit, save, and manage multiple text files in tabs. It should feel familiar to Notepad++ users, with things like line numbers, syntax highlighting for common code files, find and replace, basic file actions, and simple preferences for fonts, colors, and editor behavior. Please make the interface practical and fast rather than flashy.

Set up the project so it can be built with CMake and opened in Qt Creator. Include the app icon, basic menus, keyboard shortcuts, and sensible defaults. If anything is unclear, choose the simplest stable option and look up current Qt docs online if needed.