Add an option for shortcut generation

On Wayland, the KWin compositor has no data for the logo unless you launch the application from a .desktop file (at least I'm pretty sure, correct me if I'm wrong).

Having the option to generate a shortcut within the application would be kinda cool. I'm perfectly capable of making my own .desktop file and stuffing it in the folder, but it would be a nice option for Windows/macOS users as well.

P.S: You may want to consider adding issue templates to your repo and providing a dedicated space in the discord server for development conversation (or kindly direct me to where those channels are if they exist :)

No source files or tests are named. Start by locating the application's platform-specific launch integration and existing .desktop handling, then review how shortcut creation could work on Wayland, Windows, and macOS. Done means the application exposes an option that generates a usable shortcut on the supported platforms.

Written by the indexing model from the issue text.