fix(install): show npm install progress without gum

Show the same Installing OpenClaw package progress line in the no-gum npm install fallback before redirecting npm output to the temp log.

Fixes #82305

Co-authored-by: Sebastien Tardif <sebtardif@ncf.ca>

scripts/install.sh

@@ -880,6 +880,7 @@ run_npm_global_install() {
         return $?
     fi
 
+    ui_info "Installing OpenClaw package"
     "${cmd[@]}" >"$log" 2>&1
 }