chore: macOS setup skips installed tools and brew failures

scripts/setup_idf_macos.sh

@@ -16,8 +16,41 @@ if ! command -v brew >/dev/null 2>&1; then
   exit 1
 fi
 
-brew install \
-  git wget flex bison gperf python cmake ninja ccache dfu-util libusb libffi openssl@3
+ensure_brew_pkg() {
+  local pkg="$1"
+  if brew list --formula --versions "$pkg" >/dev/null 2>&1; then
+    echo "brew: $pkg already installed, skipping"
+  else
+    if ! brew install "$pkg"; then
+      echo "warn: failed to install $pkg via brew; continuing" >&2
+      return 0
+    fi
+  fi
+}
+
+ensure_brew_pkg_if_missing_cmd() {
+  local pkg="$1"
+  local cmd="$2"
+  if command -v "$cmd" >/dev/null 2>&1; then
+    echo "cmd: $cmd already available, skipping brew $pkg"
+  else
+    ensure_brew_pkg "$pkg"
+  fi
+}
+
+ensure_brew_pkg_if_missing_cmd git git
+ensure_brew_pkg_if_missing_cmd wget wget
+ensure_brew_pkg_if_missing_cmd flex flex
+ensure_brew_pkg_if_missing_cmd bison bison
+ensure_brew_pkg_if_missing_cmd gperf gperf
+ensure_brew_pkg_if_missing_cmd python python3
+ensure_brew_pkg_if_missing_cmd cmake cmake
+ensure_brew_pkg_if_missing_cmd ninja ninja
+ensure_brew_pkg_if_missing_cmd ccache ccache
+ensure_brew_pkg_if_missing_cmd dfu-util dfu-util
+ensure_brew_pkg libusb
+ensure_brew_pkg libffi
+ensure_brew_pkg openssl@3
 
 mkdir -p "$ESP_ROOT"
 if [[ ! -d "$IDF_DIR/.git" ]]; then