Improvements, dashboard tests, styling

[maricalucian]

Add tests, style changes to support theming, fixes and improvements

[codecov]

Codecov Report

Merging #29 into master will increase coverage by 45.72%.
The diff coverage is 98.03%.

@@             Coverage Diff             @@
##           master      #29       +/-   ##
===========================================
+ Coverage   41.55%   87.28%   +45.72%     
===========================================
  Files          26       30        +4     
  Lines         154      173       +19     
  Branches       24       38       +14     
===========================================
+ Hits           64      151       +87     
+ Misses         90       22       -68

Flag	Coverage Δ
#unittests	87.28% <98.03%> (+45.72%)	⬆️

Impacted Files	Coverage Δ
src/styles/themes/dark-theme.ts	100% <ø> (ø)	⬆️
src/styles/colors.ts	100% <ø> (ø)	⬆️
src/components/account-card/account-card.tsx	100% <ø> (+50%)	⬆️
src/library/text.tsx	88.23% <100%> (+49.77%)	⬆️
src/components/coin-dashboard/styles.ts	100% <100%> (ø)
...components/coin-balance-card/coin-balance-card.tsx	100% <100%> (+83.33%)	⬆️
src/components/convert/convert.tsx	100% <100%> (+62.5%)	⬆️
src/components/conversion-card/conversion-card.tsx	100% <100%> (+50%)	⬆️
src/screens/dashboard/dashboard.tsx	95.23% <100%> (+82.73%)	⬆️
src/components/conversion-card/styles.ts	100% <100%> (ø)
... and 16 more

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