refactor: migrate deprecated .withOpacity() to .withValues(alpha:)

[sneurlax]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 11.22995% with 498 lines in your changes missing coverage. Please review.
✅ Project coverage is 4.81%. Comparing base (8208fe7) to head (de9f7df).
⚠️ Report is 11 commits behind head on staging.

Files with missing lines	Patch %	Lines
...in_selection/exchange_currency_selection_view.dart	0.00%	62 Missing ⚠️
lib/widgets/toggle.dart	0.00%	45 Missing ⚠️
...e/subwidgets/desktop_exchange_steps_indicator.dart	0.00%	42 Missing ⚠️
...s/wallet_navigation_bar/wallet_navigation_bar.dart	0.00%	28 Missing ⚠️
...ages/token_view/sub_widgets/token_summary_sol.dart	0.00%	27 Missing ⚠️
...w/wallet_view/sub_widgets/network_info_button.dart	0.00%	26 Missing ⚠️
...s/wallet_view/sub_widgets/wallet_summary_info.dart	0.00%	22 Missing ⚠️
...exchange_view/exchange_step_views/step_3_view.dart	0.00%	17 Missing ⚠️
lib/widgets/managed_favorite.dart	0.00%	16 Missing ⚠️
...preferences_views/wallet_syncing_options_view.dart	0.00%	15 Missing ⚠️
... and 38 more

Additional details and impacted files

@@ Coverage Diff @@## staging #1376 +/- ##
===========================================
- Coverage 4.84% 4.81% -0.03% 
===========================================
Files 1092 1092 Lines 109141 109063 -78 ===========================================
- Hits 5283 5251 -32 + Misses 103858 103812 -46 

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