🔒 Fix Potential Path Traversal in StorageUtils

[ysdede]

🎯 What: Fixed a potential Path Traversal vulnerability in StorageUtils.java.
⚠️ Risk: A malicious user or app could potentially manipulate the SavePhotoPrefixPreferenceKey or SaveVideoPrefixPreferenceKey to include path traversal characters (e.g., ../), causing files to be saved outside the intended directory.
🛡️ Solution: Implemented sanitizeFilenamePrefix in StorageUtils to replace path separators (/ and \) with underscores (_) in the prefix before using it to construct filenames. Added comprehensive unit tests in UnitTest.java to verify the sanitization logic.

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PR created automatically by Jules for task 6378221743192937340 started by @ysdede

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-path-traversal-storageutils-6378221743192937340

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