Update Dashboard Tab Hover and Color Styles for Enhanced Visual Feedback

- Adjusted hover background color for inactive dashboard tab items to improve visibility.
- Refined color transition for dashboard tab close button, enhancing user interaction and visual consistency.

assets/stylesheets/App.css

@@ -3688,13 +3688,12 @@ body.objectKanbanColumnResizing * {
 }
 
 .dashboard-tab-item:not(.dashboard-tab-item-active):hover {
-  background: var(--color-button-background);
-  border: 1px solid
-    color-mix(
-      in srgb,
-      var(--color-button-border) 40%,
-      var(--color-button-background)
-    );
+  background: color-mix(in srgb, #ffffff 45%, transparent);
+  border: 1px solid var(--color-header-border);
+}
+
+.dark-mode .dashboard-tab-item:not(.dashboard-tab-item-active):hover {
+  background: color-mix(in srgb, #ffffff 2.75%, transparent);
 }
 
 .dashboard-tab-item-active {
@@ -3946,15 +3945,18 @@ body.objectKanbanColumnResizing * {
   margin-left: 1px;
   margin-right: -2px;
   border-radius: 8px;
-  color: var(--color-text-secondary, inherit);
-  opacity: 0.7;
+  color: color-mix(
+    in srgb,
+    var(--color-text-secondary, inherit) 70%,
+    transparent
+  );
   cursor: pointer;
   flex-shrink: 0;
-  transition: opacity 0.2s ease;
+  transition: color 0.2s ease;
 }
 
 .dashboard-tabs-close:hover {
-  opacity: 1;
+  color: var(--color-text-secondary, inherit);
 }
 
 .dashboard-tabs-close::before {