fix(qrc): correct QML resource paths for AUR and release builds

The QML refactor in 1.0.4 used prefix /qml with file paths like
qml/Main.qml, embedding resources at qrc:/qml/qml/Main.qml while
main.cpp loads qrc:/qml/Main.qml. Use prefix / so paths match.

Also derive the displayed app version from CMake PROJECT_VERSION and
add a qrc_resources_test to prevent this regression in CI.

src/CMakeLists.txt

@@ -18,6 +18,10 @@ set(SOURCES
 # Create executable
 add_executable(bearwave ${SOURCES})
 
+target_compile_definitions(bearwave PRIVATE
+    BEARWAVE_VERSION="${PROJECT_VERSION}"
+)
+
 # Qt Resources
 target_sources(bearwave PRIVATE qml.qrc)