feat(ui-store): onDisconnect on ui-store

[sk91]

[codecov-io]

Codecov Report

Merging #13 into master will decrease coverage by 5.66%. The diff coverage is 50%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
- Coverage     100%   94.33%   -5.67%     
==========================================
  Files           3        3              
  Lines          47       53       +6     
==========================================
+ Hits           47       50       +3     
- Misses          0        3       +3

Impacted Files	Coverage Δ
src/ui-store.js	85.71% <50%> (-14.29%)	:arrow_down:

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