This PR changes documentation files related to building the desktop
client app to allow other contributors to develop and test without
becoming stuck due to outdated docs.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
- **Documentation**
- Improved build instructions for native dependencies and E2E testing,
including updated commands and clearer server startup steps.
- Enhanced desktop client app documentation with clarified build steps,
corrected artifact paths, and added Linux installation guidance.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
