Problem
Exhibitor banner/header images are cropped by fixed-height containers with object-fit: cover, so parts of the image are cut off on both the public list cards and the detail page hero. Organizers upload a full banner and can't see it complete anywhere except in their side edit/add form image preview which shows the image as it is. There should be a cropper organizer side which takes image only with ratio which fits the public exhibition tab detail view header container. The exhibitors cards list can show cropped images as is.
Acceptance criteria
- Banner displays complete (not cropped) on the public detail hero
- Show the required dimensions/ratio as help text on the upload field
- implement a cropper for header image only which crops images only in the expected ratio
- The image should fit the container on the public detail hero

Problem
Exhibitor banner/header images are cropped by fixed-height containers with object-fit: cover, so parts of the image are cut off on both the public list cards and the detail page hero. Organizers upload a full banner and can't see it complete anywhere except in their side edit/add form image preview which shows the image as it is. There should be a cropper organizer side which takes image only with ratio which fits the public exhibition tab detail view header container. The exhibitors cards list can show cropped images as is.
Acceptance criteria