fix: desktop build script

[neriousy]

Issue for this PR

Closes #

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Fixes desktop builds trying to install @opencode-ai/plugin@local

The desktop prebuild builds the embedded opencode server through packages/opencode/script/build-node.ts. That build embedded OPENCODE_CHANNEL, but did not embed OPENCODE_VERSION. At runtime this meant the server was treated as a non-local build, while InstallationVersion still fell back to "local"

Config dependency install uses that state to decide the plugin dependency version, so it produced the invalid npm spec @opencode-ai/plugin@local

This PR embeds OPENCODE_VERSION in the node server build and makes the desktop prebuild pass its resolved OPENCODE_CHANNEL into that build explicitly. With both values present, packaged desktop installs the matching published plugin version instead of local.

If you paste a large clearly AI generated description here your PR may be IGNORED or CLOSED!

How did you verify your code works?

set these envs

$env:OPENCODE_VERSION = "1.15.4"
$env:OPENCODE_CHANNEL = "dev"

1. bun run build
2. bun run package:win
3. .\dist\win-unpacked"OpenCode Dev.exe"
4. No more error logs

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Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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[github-actions]

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What needs to be fixed:

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[github-actions]

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[github-actions]

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

Based on my search, I found one potentially related PR:

PR #27869 - "fix(nix): re-inherit patches in desktop, ad-hoc sign .app on darwin"
#27869

This PR also addresses desktop build-related issues, specifically around Nix patches and signing the .app on Darwin. It may be related to the current PR #28169 if both are addressing desktop build problems.

Additionally, PR #26202 - "fix(desktop): ensure Electron binary before predev via install.js"
#26202

This PR also deals with desktop build setup, though it's older and may already be merged.

However, note that the current PR #28169 has a minimal description (mostly template text with no actual details about the fix), so it's difficult to determine exact overlap. If you can clarify what specific desktop build issue is being addressed, I can do a more targeted search.

[github-actions]

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