fix(ui): respect Plasma style and add app branding

- Preserve the platform-selected QtQuick style on Plasma
- Add the QtPotato desktop entry and bundled app icon
- Remove the empty-state open-file action

src/CMakeLists.txt

@@ -95,6 +95,14 @@ ecm_target_qml_sources(qtpotato SOURCES
     qml/VolumeSlider.qml
 )
 
+# Bundled copy of the app icon, used when the installed one is not in the icon theme
+# (e.g. running from the build directory).
+qt_add_resources(qtpotato "icons"
+    PREFIX "/"
+    BASE icons
+    FILES icons/dev.trivk.qtpotato.svg
+)
+
 target_include_directories(qtpotato PRIVATE models mpris mpv playlist translate)
 target_compile_definitions(qtpotato PRIVATE QTPOTATO_VERSION_STRING="${PROJECT_VERSION}")
 
@@ -121,3 +129,5 @@ target_link_libraries(qtpotato PRIVATE
 )
 
 install(TARGETS qtpotato ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
+install(FILES dev.trivk.qtpotato.desktop DESTINATION ${KDE_INSTALL_APPDIR})
+install(FILES icons/dev.trivk.qtpotato.svg DESTINATION ${KDE_INSTALL_FULL_ICONDIR}/hicolor/scalable/apps)