TODO :
 - force places refresh
 - rewrite flattentTree function (bug with sub-sub-folders)

Possible features :
 - add a web search field ?
 - add some tips / rapid configuration on footer ?
 - exclude / shade some folders ?
 - screenshots on hover ?

Impossible to add :
 - refresh on bookmarks change (signal)
 - react to system color scheme change (signal)
