itemBox redesign

- Table structure rewrite to use grid layout instead
of the <table> component so that screen readers can see the content
- Added icons to mirror right-click actions
- Moved creator actions to the options menu
- Drag-drop to reorder creators
- Using editable-text instead of clicky component
- Consolidated autocomplete logic in one function
- Added @focus-ring to all components of the itemBox
- Fields are focusable and navigatable via keyboard in non-edit modes
- General refactoring to consolidate stylesheets across platforms
and remove code that's not more used (mainly related to handling old
clicky text component).
- Retractions panel background set for --material-background instead
of light pink in dark mode.

scss/linux/elements/_itemBox.scss

@@ -1,5 +1,9 @@
 item-box {
-	.zotero-clicky {
-		min-height: 17px;
+
+	#item-type-menu {
+		padding: 1px;
+		@include comfortable {
+			padding: 2px;
+		}
 	}
 }