feat: add Rspack desktop build commands

[vincentdji]

Summary

• build all Desktop targets with Rspack while retaining Webpack fallback commands
• add Rspack configurations for main, preload, renderer, Quick Look, and the development server
• preserve Electron package metadata and on-disk main/preload output during development

Testing

• yarn desktop:build:prod
• yarn desktop:serve
• verified generated package.json, main bundle, and preload bundle are written to disk
• verified renderer/index.html is served by the development server
• yarn eslint packages/suite-desktop/src/RspackConfigParams.ts packages/suite-desktop/src/rspackMainConfig.ts packages/suite-desktop/src/rspackPreloadConfig.ts packages/suite-desktop/src/rspackRendererConfig.ts packages/suite-desktop/src/rspackQuicklookConfig.ts packages/suite-desktop/src/rspackDevServerConfig.ts
• git diff --check

[sonarqubecloud]

Quality Gate failed

Failed conditions
32.4% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud