feat: show/hide balances toggle

[sneurlax]

closes #168

[codecov]

Codecov Report

❌ Patch coverage is 0.37879% with 263 lines in your changes missing coverage. Please review.
✅ Project coverage is 4.83%. Comparing base (8208fe7) to head (7818f14).
⚠️ Report is 11 commits behind head on staging.

Files with missing lines	Patch %	Lines
.../pages/wallets_view/sub_widgets/favorite_card.dart	0.00%	55 Missing ⚠️
..._menu/appearance_settings/appearance_settings.dart	1.92%	51 Missing ⚠️
.../appearance_settings/appearance_settings_view.dart	0.00%	34 Missing ⚠️
...s/wallet_view/sub_widgets/wallet_summary_info.dart	0.00%	33 Missing ⚠️
lib/widgets/hideable_balance.dart	0.00%	26 Missing ⚠️
...ib/pages/token_view/sub_widgets/token_summary.dart	0.00%	19 Missing ⚠️
...allet_view/sub_widgets/desktop_wallet_summary.dart	0.00%	14 Missing ⚠️
..._view/sub_widgets/firo_desktop_wallet_summary.dart	0.00%	11 Missing ⚠️
..._view/sub_widgets/mweb_desktop_wallet_summary.dart	0.00%	11 Missing ⚠️
lib/utilities/prefs.dart	0.00%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #1379      +/-   ##
===========================================
- Coverage     4.84%    4.83%   -0.01%     
===========================================
  Files         1092     1093       +1     
  Lines       109141   109250     +109     
===========================================
  Hits          5283     5283              
- Misses      103858   103967     +109     

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