Disable BTC token until transactions are confirmed

[srirambv]

Description

Disable BTC token until transactions are confirmed

Steps to Reproduce

1. Initiate a send transactions from Bitcoin account 1 to Bitcoin account 2
2. Ensure bitcoin account 2 received the balance but not yet confirmed
3. Initiate a send transaction from Bitcoin account 2 to Bitcoin account 3
4. Fails without any error, just exits

Actual result:

https://github.com/brave/brave-browser/assets/17010094/2c6b10fc-e6df-4e53-a349-94def95fce67

Expected result:

Should not be allowed to select unconfirmed BTC to initiate send transaction

Reproduces how often:

Easy

Brave version (brave://version info)

Brave | 1.64.19 Chromium: 121.0.6167.85 (Official Build) nightly (64-bit) -- | -- Revision | df0cc8fb071ee39fd74bcc4efeccd6b4aca33732 OS | Linux

Version/Channel Information:

• Can you reproduce this issue with the current release? NA
• Can you reproduce this issue with the beta channel? NA
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

cc: @supermassive

[supermassive]

There are two issues:

• TxService.AddUnapprovedTransaction call fails with error(which means no transaction appears in wallet's panel), and that error is not presented to ui. Should appear somehow instead of clearing input fields for send screen. In that particular case that is "insufficient funds" error
• For BTC that call takes some time so ui should somehow reflect that. Maybe just shadow overlay with in-progress indicator or something like that.

@jamesmudgett @kleantzogu @josheleonard @Douglashdaniel

[josheleonard]

needs design for overlay/indicator. cc: @jamesmudgett