Document setup and rendering, add app build and settings tests

scripts/build-app.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+swift build -c release
+bin_dir="$(swift build -c release --show-bin-path)"
+app="build/GrowthLapse.app"
+mkdir -p "$app/Contents/MacOS" "$app/Contents/Resources"
+cp "$bin_dir/GrowthLapse" "$app/Contents/MacOS/GrowthLapse"
+cp dist/GrowthLapse.app/Contents/Info.plist "$app/Contents/Info.plist"
+cp dist/GrowthLapse.app/Contents/Resources/GrowthLapse.icns "$app/Contents/Resources/GrowthLapse.icns"
+codesign --force --deep --sign - "$app"
+printf 'App erstellt: %s/%s\n' "$PWD" "$app"