refactor(View): clearer control flow and stronger edge-case handling for getFileInfo

[joshtrichards]

• Resolves: #

Summary

• Added clearer inline comments and improved method phpdoc (including the partial-file fallback behavior).
• Flattened control flow with early returns for invalid path, missing mount, and invalid storage.
• Split path handling into explicit relativePath and fullPath variables for readability.
• Improved logging context for mount/storage resolution failures.

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI