Enhancement: Add support for HEIC image format from iOS/iPadOS screenshots

[RedwindA]

What features would you like to see added?

Add support for HEIC image format, especially for iOS/iPadOS users who take screenshots and want to drag & drop them directly into LibreChat conversations. The feature should include automatic conversion of HEIC images to a supported format (like JPEG/PNG) on the frontend before uploading.

More details

Currently, when iOS/iPadOS users take screenshots, they are saved in HEIC format by default, and there's no system option to change this behavior. While the official ChatGPT website supports HEIC format, LibreChat doesn't handle these files, creating friction for Apple device users.

Proposed solution:

1. Detect HEIC format when users attempt to upload images
2. Implement client-side conversion from HEIC to JPEG/PNG
3. Upload the converted image to maintain compatibility with existing backend processing

Which components are impacted by your request?

No response

Pictures

No response

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