docs: Explain macOS Python.app Dock icon limitation

This change adds a comment to the `create-macos-app.sh` script to explain why the Solaar application may still show a Dock icon on macOS, even when it is not desired for a background utility.

On macOS, Python often runs as `Python.app`, which has its own `Info.plist` file. This built-in `Info.plist` takes precedence over the one generated for the Solaar app bundle. As a result, settings like `LSUIElement=true`, which would normally hide the Dock icon, are overridden. This comment clarifies that this behavior is a known limitation of the Python distribution on macOS and not a bug in the Solaar packaging script.

tools/create-macos-app.sh

@@ -36,6 +36,10 @@ set -euo pipefail
 # that may prevent GTK from creating a tray icon properly.
 # Workaround: Launch solaar in a detached background process
 
+# NOTE: macOS Python always uses Python.app which shows a Dock icon
+# LSUIElement=true in Info.plist would have hidden it, but Python.app has its own Info.plist
+# that overrides ours. This is a limitation of Python on macOS.
+
 if [[ "\${SOLAAR_RELAUNCHED:-}" != "1" ]]; then
     # First invocation from .app bundle - relaunch detached
     export SOLAAR_RELAUNCHED=1