Set up for dev work on my Mac

I was previously using my Linux desktop, but I also want to be able to
use my Mac laptop or Mac mini to continue working on this.

kobopatch-wasm/build.sh

@@ -5,12 +5,19 @@ SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 WEB_DIR="$SCRIPT_DIR/../web"
 SRC_DIR="$WEB_DIR/src"
 DIST_DIR="$WEB_DIR/dist"
+LOCAL_GO_DIR="$SCRIPT_DIR/go"
 
 if [ ! -d "$SCRIPT_DIR/kobopatch-src" ]; then
     echo "Error: kobopatch source not found. Run ./setup.sh first."
     exit 1
 fi
 
+# Use local Go if available
+if [ -x "$LOCAL_GO_DIR/bin/go" ]; then
+    export GOROOT="$LOCAL_GO_DIR"
+    export PATH="$LOCAL_GO_DIR/bin:$PATH"
+fi
+
 echo "Building kobopatch WASM..."
 cd "$SCRIPT_DIR"
 GOOS=js GOARCH=wasm go build -o kobopatch.wasm .