minor fixes

[stepansnigirev]

Fixes:

• If device is set to "Other" it should still have process_psbt function
• mnemonic is undefined error in adding keys for a device
• show proper error messages when combine failed due to server error
• allow pasting / scanning / uploading final raw transactions
• extra amount check in new tx screen (0.2 sat is a wrong amount)
• generic device

[ben-kaufman]

Works :) But maybe if no method is available, we should show the PSBT/ a button to copy it and tell the user to use the paste transaction button to do the signing? Right now it just brings a popup with no options. You can just take the copy PSBT functionality from the Raw PSBT section in the transaction details.

[stepansnigirev]

That's the next thing I was thinking about. I thought about adding a "Generic wallet" option that would include QR code with base64 psbt, copy-text and download file - all with the same base64 psbt. Especially taking into account that "Other" option is not available anymore in the import device screen - we show an error there if the device type is not selected.

[ben-kaufman]

That sounds even better :)

[ben-kaufman]

I think I tested most/ all cases, works great :) I guess the Generic device can be either here or in its own PR if you want to keep this to bug fixes.

[ben-kaufman]

Oh, just 2 suggestions for changes which feel too small for another PR:

• Show the Pacman loading animation on creating a hot wallet device, since it too does some lengthy communication with Bitcoin Core.
• Increment the fee steps to 0.5 instead of 0.25 in the send screen, so it doesn't start too small.

[stepansnigirev]

I think I tested most/ all cases, works great :) I guess the Generic device can be either here or in its own PR if you want to keep this to bug fixes.

Working on it already :)

[ben-kaufman]

Works great!