This commit resolves a crash happened due to connection to
`SIGNAL_WALLET_ACCOUNT_TOKENS_REBUILT` when keycard sync
flow was run in the background.
Also updated the keycard synchronization process with the current state of
the application and is the first step of many which leads towards completion
of entire syncing feature.
Keycard settings view - UI - developed in a way that list of keycards is displayed
if there is at least one keycard set up. If the a keycard is locked or gets locked it
will be correctly marked in red. Selecting keycard from the list, its details may be
seen and additional flows may be run for it (so far only unlock flow is developed).
Fixes: #7025
Sale Djenic
Boris Melnik