Import sprite first before other assets

[sentry-io[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: backend/app/commands/importer.py

Function	Unhandled Issue
import_assets	TypeError: 'NoneType' object is not iterable app.... Event Count: 4
import_assets	ParseError: not well-formed (invalid token): line 28, column 64 app.pixelstarshipsa... Event Count: 1

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