fix: resolve critical security vulnerabilities using npm overrides (#6482)

- Added npm overrides to package.json for permanent security fixes
- Updated electron to 40.8.5 (fixes 15+ high-severity vulnerabilities)
- Added overrides for flatted, lodash, brace-expansion, tar, path-to-regexp, picomatch, yaml
- npm audit --omit=dev --audit-level=high: 0 vulnerabilities
- Overrides persist across clean installs

Author: zealot-zew