Refactor sponsorship-related code and update .gitignore for macOS build

This commit removes sponsorship-related UI elements and functionality from the application, including the donation links and associated logic in the main window and radio services. Additionally, the .gitignore file is updated to exclude various macOS-specific files and directories, ensuring a cleaner build environment while retaining necessary build tooling scripts.

.gitignore

@@ -19,3 +19,27 @@ _codeql_detected_source_root
 /build*/
 !/build_tools/
 !/build_tools/**
+
+# macOS noise
+.DS_Store
+/bin
+/CMakeLists.txt.user
+/.qtcreator
+/.kdev4
+/strawberry.kdev4
+/.vscode
+/.code-workspace
+/.sublime-workspace
+/.idea
+/.vs
+/out
+/CMakeSettings.json
+/dist/scripts/maketarball.sh
+/debian/changelog
+_codeql_detected_source_root
+
+# Build output (keep build tooling scripts in /build_tools/ tracked)
+/cmake-build*/
+/build*/
+!/build_tools/
+!/build_tools/**