Reduce barcode margin / wider barcode on card page

[corobin]

Feature suggestion
make the barcode margin smaller so that the barcode stretches across more of the screen width.

Rationale
the way that Catima uses a small portion of the display to show the barcode means that it is very squished for longer barcodes, which makes resolving it more difficult and make it harder to read.

Comparison
both Stocard and Supercard uses a bigger portion of the screen width for the barcode.

Screenshots
Catima

Stocard

Supercard

Side by side

Potential objections and response

1. The example is an artificially created with an exceedingly long barcode
   A: I only noticed this issue because of a real barcode that is comparably long. It is maybe less common but certainly a realistic scenario. Further, even a relatively minor increase in width makes a pretty big difference in readability as can be seen in the stocard example.

2. you can already full-screen the barcode and adjust the size that way
   A: yes, and the other apps have that feature too. but for most barcodes i don't even need to do that since the barcode on main card screen is already perfectly readable. a minor adjustment to this page would avoid an extra step to open yet another page. it shouldn't be required to open the barcode in full screen just to be readable, that should be a convenience feature for example if it's awkward to present the middle of the device to the reader or something like that. the balance of convenience might fall the other way if the proposed change is major, but this is a small adjustment.