Review primary buttons in the application

[nondiremanuel]

After the work on #1380, we decided to review the different pages of the application to select which could be the primary buttons (shown in green), while currently we show everything as it was a secondary one. I made a tour of the application and found the following cases, excluding the installer which is already being taken care of with #1366:

• Home screen of the wallet: If there is at least one coin which timelock is expired, the "Refresh coins" button should be a primary action.
  

• Sending a transaction ("Send" tab):

  • When "Next" button gets activated (after inserting all the required data), it should be a primary button

• In the finalizing transaction screen:
  • Initially, "Sign" should be primary

• After signing, "Broadcast" should be primary

• In the popup showing up to confirm broadcasting, "Broadcast" should be primary

• "Receive" screen: here it is not clear what should the primary action be. I imagine it is mainly used to copy the address, so maybe the copy button should be the primary one.

• When opening a coin (e.g. from the "Coins" tab): if timelock expired, also here the "Refresh coin" button should be primary.
  

• When opening an unconfirmed tx: here I believe "Bump fee" should be the primary button, but it has to be discussed if instead we consider "Cancel transaction" at the same level of hierarchy; in that case leaving both secondary would be better.
  

• In the "PSBTs" tab I don't think there is a clear primary button. Maybe "New", but I don't think it is the standard flow to create a new PSBT. I would leave everything secondary at the moment.

• In Settings>Node: when entering a rescan date, "Start Rescan" should be primary
  

• In Settings>Recovery: "Next" should be primary when active
  

Am I missing anything? Feel free to add or discuss any of the above points.