Clean up review feedback in SecurityUtils filename sanitization

[Copilot]

Two minor issues flagged in code review of the path traversal hardening changes:

• Remove redundant try/catch in SecurityUtils.sanitizeFileName() — String.replace() never throws, so the block implied false error-handling semantics
• Rename test method testSanitizeFileName_onPathSegmentLikeInputs → testSanitizeFileNameOnPathSegmentLikeInputs to match the camelCase convention used throughout SecurityUtilsTest

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[Copilot]

Pull request overview

This PR addresses two code review feedback items from the path traversal hardening changes in SecurityUtils.sanitizeFileName(): removing an unnecessary try-catch block around String.replace() operations that never throw exceptions, and renaming a test method to follow the consistent camelCase naming convention used throughout the test file.

Changes:

• Removed redundant try-catch block in SecurityUtils.sanitizeFileName() since String.replace() never throws exceptions
• Renamed test method from testSanitizeFileName_onPathSegmentLikeInputs to testSanitizeFileNameOnPathSegmentLikeInputs to match camelCase convention

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
mastodon/src/main/java/de/icod/techidon/utils/SecurityUtils.java	Removed unnecessary try-catch wrapper around String.replace() calls in sanitizeFileName()
mastodon/src/test/java/de/icod/techidon/utils/SecurityUtilsTest.java	Renamed test method to follow camelCase naming convention

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