fix(legacy): show XPUB using a QR code

[romanz]

Similar layout to fsm_layoutAddress is used.

Fixes #3043.

[github-actions]

core UI changes	device test	click test	persistence test
T2T1 Model T	test(screens) main(screens)	test(screens) main(screens)	test(screens) main(screens)
T3B1 Safe 3	test(screens) main(screens)	test(screens) main(screens)	test(screens) main(screens)
T3T1 Safe 5	test(screens) main(screens)	test(screens) main(screens)	test(screens) main(screens)
All	main(screens)

[prusnak]

Do all possible XPUBs (bip-44, 49, 84, 86) fit on the device screen?

[romanz]

The screenshot below is for
xpub6BiVtCpG9fQPxnPmHXG8PhtzQdWC2Su4qWu6XW9tpWFYhxydCLJGrWBJZ5H6qTAHdPQ7pQhtpjiYZVZARo14qHiay2fvrX996oEP42u8wZy BIP-44 XPUB and due to its size, it requires two pages of text.

The QR code is rendered with a higher resolution, and looks like it fits on the screen:

@prusnak I will make sure that we have tests covering all XPUB types.

[prusnak]

The QR code is rendered with a higher resolution, and looks like it fits on the screen:

Yes, it fits. But I doubt this can be read by any camera. Even QR codes with doubled pixels are quite problematic to be read by most of the cameras from T1 display.

I am not saying we should not merge this PR, I am just saying that doing so probably does not add much value unfortunately. :-/

[romanz]

I understand, thanks @prusnak!

If preferable, I think that we can fix the original issue (XPUB layout being non-cancellable) using 405a1cb, WDYT?

CC: @Hannsek

[prusnak]

If preferable,

No strong opinion. I am fine with both approaches. Maybe we can show the QR for consistency with GetAddress, but like I said, scanning it might be very problematic.

[Hannsek]

It can be read by iPhone (13) camera. Older phones might have a problem. I don't think that lot of users do that anyway. Therefore I would proceed with the pr and leave the qr there for consistency.

[prusnak]

Therefore I would proceed with the pr and leave the qr there for consistency.

ACK

[bosomt]

tested on my Nothing phone 1 with Android 15
i needed to zoom but QR code was successfully scanned 🎉