fix(release): use workspace electron-builder for desktop packaging

[juliusmarminge]

Summary

• Add electron-builder@26.8.1 as an explicit apps/desktop dev dependency.
• Run the desktop packager through vp exec --filter @t3tools/desktop -- electron-builder --projectDir <stage app> instead of vp dlx electron-builder.
• Keep the generated staged app as electron-builder's project directory, so packaging still reads the staged package.json and build config.

Why

The new release logs from https://github.com/pingdotgg/t3code/actions/runs/26931004313/job/79450756574 showed NSIS failing here:

!include: could not find: ...\pnpm-cache\dlx\...\app-builder-lib\templates\nsis\include\StdUtils.nsh

The file exists in app-builder-lib@26.8.1, but the vp dlx pnpm cache path on Windows is very long and transient. Using the desktop package's installed electron-builder gives NSIS a stable install path while still packaging the staged app via --projectDir.

Validation

• vp exec --filter @t3tools/desktop -- electron-builder --version
• verified workspace app-builder-lib contains templates/nsis/include/StdUtils.nsh
• vp run --filter scripts typecheck
• vp run --filter scripts test -- build-desktop-artifact.test.ts
• vp check
• vp run typecheck

Note

Use workspace electron-builder for desktop packaging via pnpm exec

• Adds electron-builder@26.8.1 as a dependency in apps/desktop/package.json so it is available through the workspace toolchain.
• Changes buildDesktopArtifact in scripts/build-desktop-artifact.ts to run pnpm exec --filter @t3tools/desktop -- electron-builder from the repo root instead of pnpm dlx electron-builder from the staged app directory, passing --projectDir explicitly to point at the staged directory.

^{Macroscope summarized 052c9e4.}

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[macroscopeapp]

Approvability

Verdict: Approved

Build tooling change that switches electron-builder from dlx (download on-the-fly) to a workspace dependency. The script and lockfile changes are mechanical, affecting only how the desktop app is packaged during CI, not runtime behavior.

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Dismissing prior approval to re-evaluate 052c9e4

[github-actions]

🚀 Expo continuous deployment is ready!

• Project → t3-code
• Platforms → android, ios
• Scheme → t3code-preview

	🤖 Android	🍎 iOS
Fingerprint	251694208975e82c56bd5289d014d27db782d79c	88f9ec34318a3522ac20299028ec60ca0080a665
Build Details	Build Permalink Details Distribution: INTERNAL Build profile: preview:dev Runtime version: 251694208975e82c56bd5289d014d27db782d79c App version: 0.1.0 Git commit: fff460b4abc01f29f5b2cdb5bf25d955066816ee	Build Permalink Details Distribution: INTERNAL Build profile: preview:dev Runtime version: 88f9ec34318a3522ac20299028ec60ca0080a665 App version: 0.1.0 Git commit: fff460b4abc01f29f5b2cdb5bf25d955066816ee
Update Details	Update Permalink Details Branch: pr-2938 Runtime version: 251694208975e82c56bd5289d014d27db782d79c Git commit: 669d53f29cb737952f531f0756e0db00d475e028	Update Permalink Details Branch: pr-2938 Runtime version: 88f9ec34318a3522ac20299028ec60ca0080a665 Git commit: 669d53f29cb737952f531f0756e0db00d475e028
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