feat: always use Context type instead of optional null

[jvanveen]

Checklist

• [ ] Functionality works & meets specifications
• [ ] Code reviewed
• [ ] Code unit/integration/system tested
• [ ] User documentation updated
• [ ] Clean commits
• [ ] No warnings during install
• [ ] Added Feature/Fix to release notes

[codecov[bot]]

Codecov Report

Merging #92 into master will not change coverage. The diff coverage is 100%.

@@         Coverage Diff          @@
##           master   #92   +/-   ##
====================================
  Coverage      93%   93%           
====================================
  Files          18    18           
  Lines         144   144           
  Branches       20    20           
====================================
  Hits          134   134           
  Misses         10    10

Flag	Coverage Δ
#unit	93% <100%> (ø)	:arrow_up:

Impacted Files	Coverage Δ
src/store/state.ts	100% <ø> (ø)	:arrow_up:
src/store/getters.ts	100% <100%> (ø)	:arrow_up:

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