chore: bump version to v2026.4.403 and refactor settings}
- Bump version from v2026.4.402 to v2026.4.403 in package.json and README.md
- Remove redirect-to-settings guard from Angular DatabaseComponent when
no connection is present, allowing the page to remain on /database
- Remove equivalent redirect-to-settings useEffect from React DatabasePage
- Refactor SettingsService: replace lazy i18n getter with resolveAutoLang()
method that inlines the currentLang resolution and adds explicit typing