Feature: Better style for sidebar bookmarks and middle click to close

[timotheeguerin]

fix #1253
fix #1217 (Close middle click)

Virtual folder show slightly transparent to let user know its now actually present until uploading files

[codecov]

Codecov Report

Merging #1254 into master will decrease coverage by 0.01%.
The diff coverage is 38.88%.

@@            Coverage Diff             @@
##           master    #1254      +/-   ##
==========================================
- Coverage   53.37%   53.35%   -0.02%     
==========================================
  Files         958      959       +1     
  Lines       22165    22177      +12     
  Branches     2479     2481       +2     
==========================================
+ Hits        11830    11833       +3     
- Misses      10335    10344       +9

Impacted Files	Coverage Δ
src/@batch-flask/ui/sidebar/index.ts	100% <100%> (ø)	⬆️
src/@batch-flask/ui/sidebar/sidebar.module.ts	100% <100%> (ø)
...@batch-flask/ui/sidebar/sidebar-bookmarks/index.ts	100% <100%> (ø)
...r/sidebar-bookmarks/sidebar-bookmarks.component.ts	19.23% <19.23%> (ø)
...count/action/add/batch-account-create.component.ts	74.13% <80%> (+0.14%)	⬆️

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