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fix(attachments): fix `HEIC/HEIF` thumbnail generation by converting to `JPEG` DEV-1289 (#6484)

### 📣 Summary
Fixes an issue where images submitted in `HEIC/HEIF` format did not show
a preview in UI. These images now generate standard `JPEG` thumbnails,
allowing them to appear normally in the data table and attachment
preview screens.

### 📖 Description
Previously, image files submitted in `HEIC/HEIF` format failed to
display a preview because backend could not generate thumbnails for
these formats. This update automatically converts `HEIC/HEIF` images
into `JPEG` thumbnails while keeping the original file unchanged. As a
result, previews now load reliably across all browsers and devices.

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