fix: rename desktop entry file to resolve Wayland icon issue

[Integral-Tech]

According to Desktop Entry Specification:

The name of the desktop entry should follow the "reverse DNS" convention: it should start with a reversed DNS domain name controlled by the author of the application, in lower case. The domain name should be followed by the name of the application, which is conventionally written with words run together and initial capital letters (CamelCase). For example, if the owner of example.org writes "Foo Viewer", they might choose the name org.example.FooViewer, resulting in a file named org.example.FooViewer.desktop.

Before:

After: