fix: multiple small style fixes/improvements (#316)

* fix(ui-nav): use selected ring and remove item margin override

* fix(listings): format prices as 1.234,50 € with tabular numerals

* fix(listings): align watchlist star button styles

* fix(version-banner): set margin-bottom to 16px

* fix(ui-nav): keep selected ring with focus reset

* fix(listings): right-align price values

* fix(listings): remove cart icon from price display

* fix(listings): format detail price with shared formatter

* revert(listings): restore grid tile layout from master

Drop watchlist/actions restyle on grid cards.

ui/src/components/version/VersionBanner.less

@@ -1,5 +1,5 @@
 .versionBanner {
-  margin-bottom: 0 !important;
+  margin-bottom: 16px;
 
   .semi-banner-body {
     padding: 6px 16px;