Merge #850: Gui show transaction detail while signing

7d97f46 ui: add processing hw notification to components (edouardparis)
1ea292f gui: merge psbt signatures instead of override full psbt (edouardparis)
a539cfe Add ui component toast from iced repo examples (edouardparis)
71bc585 encapsulate psbt actions in enum (edouardparis)
e55269d Make psbt action components handle the whole view (edouardparis)

Pull request description:

  Fixes #644.

ACKs for top commit:
  edouardparis:
    Self-ACK 7d97f46

Tree-SHA512: 497e1edafa2755e39498b5cfb0e90c978a5575fcdc544ee478af3468f39097133de6595db739fdc2ec004d3a8a0b3be715c389a44c745d8ba4802aa44612e20a

gui/src/app/message.rs

@@ -31,7 +31,7 @@ pub enum Message {
     SpendTxs(Result<Vec<SpendTx>, Error>),
     Psbt(Result<Psbt, Error>),
     Recovery(Result<SpendTx, Error>),
-    Signed(Result<(Psbt, Fingerprint), Error>),
+    Signed(Fingerprint, Result<Psbt, Error>),
     WalletRegistered(Result<Fingerprint, Error>),
     Updated(Result<(), Error>),
     Saved(Result<(), Error>),