feat(GUI): adding total balance to wallet widget

[kehiy]

Example:

[codecov]

Codecov Report

Merging #1194 (0b4cf5d) into main (998a1ca) will decrease coverage by 0.08%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1194      +/-   ##
==========================================
- Coverage   81.44%   81.36%   -0.08%     
==========================================
  Files         179      179              
  Lines        9500     9531      +31     
==========================================
+ Hits         7737     7755      +18     
- Misses       1381     1390       +9     
- Partials      382      386       +4