feat: Show header images in full on iPad in landscape mode

[surfdude29]

Describe the feature you'd like to request

Currently, when using Graysky on an iPad in landscape mode header images can be cropped with unfortunate results, e.g.:

Compare this to how the same person's profile looks on the web:

Describe the solution you'd like to see

To avoid this issue when in landscape mode on an iPad, I suggest 'pillarboxing': showing the full header image centred with black bars at the side.

Additional information

No response