fix: force frontend sourcemaps in desktop builds

[benceruleanlu]

Ensure desktop source builds explicitly set GENERATE_SOURCEMAP=true when building the frontend so Sentry can resolve stack traces even if release zips omit maps.

Tests: yarn typecheck, yarn lint:check, yarn format, yarn lint

┆Issue is synchronized with this Notion page by Unito

Summary by CodeRabbit

• Chores
  • Enhanced build configuration to enable source map generation for improved debugging and development processes.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR adds the GENERATE_SOURCEMAP: 'true' environment variable to the frontend build step in the build script, enabling source map generation during the build process without modifying any build logic or error handling.

Changes

Cohort / File(s)	Summary
Frontend Build Configuration scripts/downloadFrontend.js	Added GENERATE_SOURCEMAP: 'true' environment variable to the pnpm build invocation for source map generation during frontend build.

Possibly related PRs

• Comfy-Org/desktop#1503: Also modifies environment variables passed to the frontend build in scripts/downloadFrontend.js by adding COREPACK_ENABLE_STRICT: '0'.
• Comfy-Org/desktop#1502: Modifies the same build invocation in scripts/downloadFrontend.js, switching command execution to use pnpm.

Poem

🐰 A map for our sources, so clear and so bright,
Debug trails now visible, what a delight!
One simple variable, set to true,
Helps developers trace through the code they pursue.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: explicitly setting GENERATE_SOURCEMAP=true in the frontend build step for desktop builds.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/desktop-frontend-sourcemaps

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[Copilot]

Pull request overview

This PR ensures that frontend source builds for the desktop application explicitly enable sourcemap generation by setting GENERATE_SOURCEMAP=true as an environment variable during the build process. This allows Sentry to properly resolve stack traces from production builds even when release artifacts omit the source maps.

Changes:

• Added GENERATE_SOURCEMAP: 'true' environment variable to the frontend build command when building from source

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