Channel scan select

[Robert-0410]

I believe this is related to #953.

Implemented a new dialog that is prompted when the user scans a correct QR code. The dialog provides additional
actions they can perform such as:

• Cancel: maintains the users current channels.
• Replace: makes the scanned channels the new user channels. (What would happen before)
• Save: appends the selected channels to the users existing channels.

Notes

• The save button will only be enabled if the sum of the current and selected channels is <= max channels.
• The user can delete channels to make space, if cancel is pressed we maintain the same channels we had before the scan.

[andrekir]

needs a few small changes but nice work!

regarding the buttons:

Replace: makes the scanned channels the new user channels. (What would happen before)

convention is the default action ("positive") is placed on the right side of the dialog.

Save: appends the selected channels to the users existing channels.

ensure the dialog buttons provide clear feedback of what they do: "Save" should read "Add".

[andrekir]

well done, thanks!

[Robert-0410]

Thank you!!