Fix Windows Harness process startup

[wisdomqin]

What changed

• Launch the bundled Harness through Electron's utilityProcess.fork() instead of respawning the application executable with ELECTRON_RUN_AS_NODE.
• Preserve the existing loopback port, launch directory, DSH_HOME, stdout/stderr capture, and Node internal-loader flag.
• Add utility-process startup diagnostics and readable Windows Crashpad exit-code reporting.
• Add regression coverage for the Windows launch environment and 0xFFFF7003 diagnosis.

Why

On Windows Server 2022, the respawned Electron executable terminated before the DSH entrypoint produced any stdout or stderr. Windows returned 4294930435 (0xFFFF7003, Crashpad handler unavailable), leaving only the desktop launch preamble in harness.log.

Using Electron's Node utility process keeps the Harness child inside Electron's supported process lifecycle and avoids respawning the application executable as a standalone Node process.

Validation

• npm test -- --run — 56 tests passed.
• npm run typecheck — passed.
• npm run build — passed.
• macOS development runtime smoke test — utility process started, DSH logged its loopback URL, and HTTP returned 200.
• Windows x64 package and runtime behavior still require the Windows Server 2022 test package requested for this PR.

[wisdomqin]

Windows x64 Dev test package is ready.

• Artifact: https://github.com/dataelement/dsh-desktop/actions/runs/31879206055/artifacts/9245596305
• App identity: DSH Desktop Dev (io.dsh.desktop.dev)
• Artifact ZIP SHA-256: 4a84343c35b49c679a9d7e4c390305329de071e674b2de2c929753b281582df6
• CI: Windows tests, typecheck, packaging, and artifact upload passed.

This package is isolated from the formal installation and uses %APPDATA%\dsh-desktop-dev. If startup still fails, please attach %APPDATA%\dsh-desktop-dev\logs\harness.log.

[wisdomqin]

Superseding the earlier test artifacts: Windows now launches Harness with a bundled Node.js 24.9.0 runtime instead of the Electron executable/utility process.

The packaged DSH Desktop Dev.exe was launched on Windows Server 2022, its Harness endpoint returned HTTP successfully, the process remained stable for the post-ready observation window, and no worker fatal error was logged.

• Validated artifact: https://github.com/dataelement/dsh-desktop/actions/runs/31881463892/artifacts/9246159228
• Artifact ZIP SHA-256: db661922e2ced49b7500ce18f1a8880c3edea0cd04f15a2e5196dcc35c48ae63
• Run: https://github.com/dataelement/dsh-desktop/actions/runs/31881463892

[wisdomqin]

A validated Windows Dev build is now available as a GitHub Pre-release for faster direct download:

https://github.com/dataelement/dsh-desktop/releases/download/windows-harness-test-20260815.1/dsh-desktop-dev-windows-x64-setup.exe

The pre-release points to 6729668 and does not change the formal Latest release (v0.1.7).

[wisdomqin]

Windows diagnostic pre-release .2 is available: https://github.com/dataelement/dsh-desktop/releases/download/windows-harness-test-20260815.2/dsh-desktop-dev-windows-x64-setup.exe

Changes: 120s Windows startup allowance plus a bundled-Node diagnostic entry that logs Node version/platform/arch, executable path, cwd, DSH_HOME, DSH entry loading, timed wait progress, uncaught errors, and the real process exit code. The packaged Windows smoke test passed before the pre-release was published.

[wisdomqin]

Added two desktop UX improvements:

• show a lightweight localized splash animation while the bundled Harness starts
• pin DSH Desktop to the native host directory picker on macOS and Windows

Verification:

• 59 tests passed
• typecheck and production build passed
• Windows Server 2022 packaged EXE smoke test passed (HTTP ready, stable process, no Harness stderr)

Windows test installer: https://github.com/dataelement/dsh-desktop/releases/download/windows-harness-test-20260815.3/dsh-desktop-dev-windows-x64-setup.exe

SHA-256: a88fe050b1048ab8c0d783f82376a8def8e5aff117751daf7427606077ccfa2f

[wisdomqin]

Fixed the native workspace picker regression introduced by the previous composition patch. The native interaction requires both the Host backend and the renderless Client surface; both are now pinned.

Verified locally:

• sidebar Add workspace action is present
• clicking the no-workspace composer opens the native macOS directory chooser
• 59 tests and typecheck pass

Windows Server 2022 packaged EXE smoke test also passed.

Updated Windows test installer: https://github.com/dataelement/dsh-desktop/releases/download/windows-harness-test-20260815.4/dsh-desktop-dev-windows-x64-setup.exe