chore: bump version to v2026.4.406 and fix TTL refresh flow}
- Bump version from v2026.4.404 to v2026.4.406 in package.json and README.md
- Fix TTL persist/expire in Angular: call cmd.refresh() before refreshing key with withoutParent flag to update the tree first
- Fix TTL persist/expire in React: call useMainCommandStore refresh before loadKey in each branch instead of a single loadKey after the if/else
- Show version overlay in Electron builds by removing the isElectron guard in Layout.tsx
- Update .npmignore: remove /src/**/* exclusion and add /scripts exclusion