style(resolver): improve context menu accessibility and spacing

web/css/resolver-main.css

@@ -3948,7 +3948,8 @@
     display: none !important;
 }
 
-.mr-context-menu-item:hover {
+.mr-context-menu-item:hover,
+.mr-context-menu-item:focus-visible {
     background: rgba(255, 255, 255, 0.1);
 }
 
@@ -3972,7 +3973,7 @@
 .mr-context-menu-divider {
     height: 1px;
     background: var(--mr-border-strong, rgba(255, 255, 255, 0.14));
-    margin: var(--mr-spacing-4) 0;
+    margin: 0;
 }
 
 .mr-download-folder-context {
@@ -9646,4 +9647,4 @@ a.mr-image-preview-resource-name:hover {
 
 .litegraph.litecontextmenu .litemenu-entry.mr-model-resolver-node-menu::before {
     margin-right: var(--mr-spacing-6);
-}
+}