fix(desktop): omit undefined IPC payload fields - #50333

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The following comment was made by an LLM, it may be inaccurate:

I've verified the fix in the Windows desktop development app and added a screenshot and test results to the PR description.

Could a maintainer approve the pending CI workflows and manually link #50153? The description includes Closes #50153, but this PR targets v2, while the default branch is dev.

Thank you!

Independent verification on the packaged Windows build (Desktop 2.0.12, Windows 11 10.0.26200), for the "no packaged build has been verified" note above.

Method: instrumented the shipped renderer's IPC port (MessagePort) and replayed requests through the real RPC transport.

1. The pre-fix payload reproduces the reported defect exactly:

Request: { tag: "FilesOpenFilePicker", payload: { options: { multiple: true, title: undefined, extensions: undefined } } }
Exit:    { _tag: "Failure", cause: [ { _tag: "Die", defect: "Expected string | null\n  at [\"options\"][\"title\"]" } ] }

2. With undefined omitted at the renderer's request boundary (the approach in this PR), the same UI action emits:

{ options: { multiple: true, defaultPath: "C:\\dev" } }

and the decode failure no longer occurs (no Die cause, no generic toast).

Scope note for reviewers: in the shipped bundle the request boundary (Ut in /out/renderer/assets/main-C16eq30x.js) is shared by every Files*, Menu* and Window* request, so the same undefined-field rejection also covers FilesOpenPath (application), the save dialog and the directory picker - consistent with the regression cases listed in this PR.

Caveat: this is packaged-binary verification (normalized the request boundary in the installed renderer), not a build of this branch, and the native dialog itself was not visually confirmed in my remote session.

Confirmed the same failure in OpenCode Desktop 2.0.12, Linux x64 AppImage on Omarchy/Hyprland, with Nautilus 50.3.1.

Clicking Open in File Manager consistently shows “Desktop IPC handler failed,” including after restarting the desktop.

Captured the underlying RPC failure through the renderer debugger:

Expected string | null
  at ["application"]

The renderer sends FilesOpenPath with application: undefined. Nautilus launches normally when invoked directly. This matches the FilesOpenPath regression case in this PR.

No configured plugins. The installed AppImage was tested; this PR’s build has not been tested locally.

Thanks @ilajosmanov and @Vibe-coding-nvm-delete-repo for the independent confirmations on Linux and the packaged Windows build.

These findings match the regression cases already covered by this PR, including FilesOpenPath with application: undefined, and further confirm that the issue is at the shared renderer IPC request boundary rather than being specific to the Windows file picker.

Confirmed this still reproduces on OpenCode Desktop 2.0.13 on Windows.

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