chore(deps): update Electron packaging dependencies

[bet4it]

While working on a Nix package for Spool, I noticed a few Electron packaging dependencies had fallen a bit behind. This PR refreshes the desktop packaging/runtime stack with focused dependency updates.

• electron from ^34.5.0 to ^41.6.1

  • Electron 34 is several major versions behind current Electron releases.
  • Electron 41.6.1 is a newer mainstream version and currently matches the default Electron version in nixpkgs.
  • I tested the app with this version and did not notice any visual or UI regressions.

• electron-builder from ^26.0.12 to ^26.8.2

  • The previous resolved version, 26.8.1, has issues collecting some pnpm transitive dependencies during packaging.
  • In one packaged build, effect was included but its runtime dependency fast-check was missing, causing a startup failure.
  • 26.8.2 includes the pnpm dependency collection fix.

• better-sqlite3 from ^11.10.0 to ^12.10.0 in both @spool/app and @spool-lab/core

  • The previous version was behind the current 12.x release line.
  • Updating it keeps the native SQLite dependency aligned with newer Electron/Node headers.