refactor: remove mixins/item.css in favor of components/item.css (#9369)

Author: vursen

packages/vaadin-lumo-styles/components/combo-box.css

@@ -23,7 +23,7 @@
 @import '../src/components/combo-box-overlay.css' vaadin-combo-box-overlay;
 
 @import '../src/mixins/base-layer-reset.css' vaadin-combo-box-item;
-@import '../src/mixins/item.css' vaadin-combo-box-item;
+@import '../src/components/item.css' vaadin-combo-box-item;
 @import '../src/components/combo-box-item.css' vaadin-combo-box-item;
 
 @import '../src/mixins/base-layer-reset.css' vaadin-combo-box-scroller;

packages/vaadin-lumo-styles/components/multi-select-combo-box.css

@@ -29,7 +29,7 @@
 @import '../src/components/multi-select-combo-box-chip.css' vaadin-multi-select-combo-box-chip;
 
 @import '../src/mixins/base-layer-reset.css' vaadin-multi-select-combo-box-item;
-@import '../src/mixins/item.css' vaadin-multi-select-combo-box-item;
+@import '../src/components/item.css' vaadin-multi-select-combo-box-item;
 @import '../src/components/combo-box-item.css' vaadin-multi-select-combo-box-item;
 @import '../src/components/multi-select-combo-box-item.css' vaadin-multi-select-combo-box-item;
 

packages/vaadin-lumo-styles/components/time-picker.css

@@ -21,7 +21,7 @@
 @import '../src/components/time-picker-overlay.css' vaadin-time-picker-overlay;
 
 @import '../src/mixins/base-layer-reset.css' vaadin-time-picker-item;
-@import '../src/mixins/item.css' vaadin-time-picker-item;
+@import '../src/components/item.css' vaadin-time-picker-item;
 @import '../src/components/combo-box-item.css' vaadin-time-picker-item;
 
 @import '../src/mixins/base-layer-reset.css' vaadin-time-picker-scroller;