feat(head): add :mode to title component

[kiaking]

Add :mode to <SHeadTitle>. To create this design along with #325.

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (cc26861) 84.41% compared to head (5d19348) 84.43%.

❗ Current head 5d19348 differs from pull request most recent head 00a4baf. Consider uploading reports for the commit 00a4baf to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
+ Coverage   84.41%   84.43%   +0.01%     
==========================================
  Files         139      139              
  Lines       11084    11097      +13     
  Branches      491      491              
==========================================
+ Hits         9357     9370      +13     
  Misses       1727     1727              

Files Changed	Coverage Δ
lib/components/SHeadTitle.vue	100.00% <100.00%> (ø)

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