chore: add unit test for platform.ts utility

[devin-ai-integration]

• Added unit tests for platform.ts utility in the same directory as requested
• Tests cover successful package manager detection cases and error cases
• All tests are passing

Link to Devin run: https://app.devin.ai/sessions/ae832e5a376445cd8b01a0f21054d11a
Created for: Razvan Marescu

[devin-ai-integration]

Original prompt from Razvan:

Received message in Slack channel #shortest:

@Devin for antiwork/shortest add a unit test file for packages/shortest/src/utils/platform.ts in the same folder as the file, named platform-test.ts

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Name	Status	Preview	Comments	Updated (UTC)
shortest	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 1, 2025 4:39am

[devin-ai-integration]

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