Feature/media handling overhaul

[daveaugustus]

Why Merge This PR?

This PR fixes the annoying issue where deleted profile pictures would still show up in the UI. I've also smoothed out the profile loading experience so it feels a bit snappier.

Changes included:

• Backend Fixes: Added existence checks to the storage V2 endpoints. Now, if a file is missing in MinIO, the API correctly returns a 404 instead of a stale URL. This ensures the frontend fallback logic actually works.
• Caching: Cleaned up the Cache-Control headers by removing the immutable flag. This prevents browsers from holding onto old or deleted assets indefinitely.
• UI Enhancements:
  • The profile placeholder (initials) now appears instantly while the image is loading, so users don't see that gray pulse/blank state anymore.
  • Improved the visibility of the initials with bold text and a subtle border so they look good in both light and dark modes.

Issue Fixed

• Fixed profile picture ghosting after deletion.
• Improved profile image loading UX.

Integration Status

• Feature development
• Bug Fix
• Documentation
• UI Improvements
• Code Refactor
• Tests

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[github-actions]

🏷️ [bumpr]
Next version:v2.5.0
Changes:v2.4.6...the-monkeys:feature/media-handling-overhaul