Small GUI tweaks: spawning account and button labels

[brusherru]

No issue.

It contains some tweaks, each in the separate commit.
So you can check them out one by one.

1. Changed labels of the button in password prompts, sometime there was a pretty long labels that does not fit the button width. For example, replaced "Enter password to sign transaction" with "Sign transaction".

2. Added missing padding in Send transaction popup for "Spawn" transaction (not SelfSpawn!)

3. On the same screen disabled already spawned accounts in the dropdown.
   However, wallet app does not fetch all the transactions for all the accounts in the beginning. It will fetch them only when you switch to the account due to not overload API with huge amount of requests. So if you didn't switch to some account — it won't be disabled.

   • The good news, that @kacpersaw is already working on improvement of API to make it possible and cheap to retrieve a list of spawned accounts. Then it will be added and work perfectly.
   • Another good news, that even if User will submit Spawn transaction for already spawned account it will be rejected pretty soon and won't stuck in the mempool.

4. Added hints about spawning account to reduce User's confusion about it.
   These hints are displayed only until account is Spawned.
   It has three states:

   • (1) no funds (or less than 105k smidges, which is required for SelfSpawn transaction)
     
   • (2) instructions how to send self-spawn transaction
     
   • (3) waiting for the transaction to be applied
     

[github-actions]

You can preview the changes at : https://2e5d1cab.smapp-lite-prod.pages.dev

[github-actions]

You can preview the changes at : https://a05d6532.smapp-lite-prod.pages.dev