Add support to HEIC/HEIF image format

### Steps to reproduce

Not that I am happy about this state of fact, but it seems that modern Samsung phones do not save pictures taken with the camera as classical JPEG file, but as (Apple I guess?) HEIF image files, with the mime-type "image/heic". When a contact send one of these pictures, I can see it on my (non Samsung) phone with Element, but not with Element X

### Outcome

As it seems Element X will be the future official Android client, I guess this is a missing feature ?

Regards,

### Your phone model

Asus

### Operating system version

Android 12

### Application version and app store

Version 25.09.0 (202509000)

### Homeserver

_No response_

### Will you send logs?

Yes

### Are you willing to provide a PR?

No

Start by reproducing the issue on an Asus phone running Android 12 with Element X version 25.09.0, using an incoming image/heic attachment and comparing the result with Element. Trace the existing image-format handling and confirm the supported HEIC/HEIF behavior; done means these attachments display correctly in Element X.

Written by the indexing model from the issue text.