fix: ensure npm install runs when Express version mismatch is detected

- Set should_update_deps=true when Express version mismatch is found
- Previously, the installer would detect the mismatch but still skip npm install
- This was causing the path-to-regexp error to persist even after detection

The installer will now properly update dependencies when it detects
that Express version is not 4.19.2.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/install-pulse.sh

@@ -2211,6 +2211,7 @@ case "$INSTALL_MODE" in
                     should_update_deps=false
                 else
                     print_warning "Express version mismatch detected ($current_express_ver vs 4.19.2). Will update dependencies."
+                    should_update_deps=true
                 fi
                 cd ..
             fi