feat: focus a new declaration prop automatically

[ktsn]

fix #12

[codecov]

Codecov Report

Merging #18 into master will increase coverage by 0.48%.
The diff coverage is 70%.

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
+ Coverage   62.99%   63.48%   +0.48%     
==========================================
  Files          40       41       +1     
  Lines        1308     1320      +12     
  Branches      323      314       -9     
==========================================
+ Hits          824      838      +14     
+ Misses        469      467       -2     
  Partials       15       15

Impacted Files	Coverage Δ
src/view/components/StyleInformation.vue	0% <0%> (ø)	⬆️
src/view/components/StyleValue.vue	100% <100%> (ø)	⬆️
src/view/components/StyleDeclaration.vue	100% <100%> (ø)

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