@remotion/browser-studio: Include config in downloaded projects

[JonnyBurger]

Summary

• add the default remotion.config.ts to the blank Browser Studio virtual filesystem
• include the config automatically in downloaded project archives
• cover template parity and archive contents in tests

Testing

• bun test packages/browser-studio/src/test/template-blank.test.ts packages/browser-studio/src/test/download-project.test.ts
• bun run build
• bun run stylecheck

Closes #9820

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview	Jul 30, 2026 7:53am
remotion	Ready	Preview	Jul 30, 2026 7:53am

[pullfrog]

✅ No new issues found.

Reviewed changes — added a remotion.config.ts to the blank Browser Studio virtual filesystem so it's included in downloaded project archives.

• blank.ts VFS: adds /project/remotion.config.ts matching the source template-blank config file
• template-blank test: asserts the VFS content matches the source template file on disk
• download-project test: verifies remotion.config.ts is included in the downloaded zip archive

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