[feat] Enhance MultiSelect component and Storybook stories (#5154)

.storybook/preview-head.html

@@ -4,17 +4,26 @@
     transition: background-color 0.3s ease, color 0.3s ease;
   }
 
-  /* Light theme default */
-  body {
-    background-color: #ffffff;
-    color: #1a1a1a;
+  /* Light theme default - with explicit color to override media queries */
+  body:not(.dark-theme) {
+    background-color: #fff !important;
+    color: #000 !important;
+  }
+
+  /* Override browser dark mode preference for light theme */
+  @media (prefers-color-scheme: dark) {
+    body:not(.dark-theme) {
+      color: #000 !important;
+      --fg-color: #000 !important;
+      --bg-color: #fff !important;
+    }
   }
 
   /* Dark theme styles */
   body.dark-theme,
   .dark-theme body {
-    background-color: #0a0a0a;
-    color: #e5e5e5;
+    background-color: #202020;
+    color: #fff;
   }
 
   /* Ensure Storybook canvas follows theme */
@@ -24,11 +33,33 @@
 
   .dark-theme .sb-show-main,
   .dark-theme .docs-story {
-    background-color: #0a0a0a !important;
+    background-color: #202020 !important;
   }
 
-  /* Fix for Storybook controls panel in dark mode */
-  .dark-theme .docblock-argstable-body {
-    color: #e5e5e5;
+  /* CSS Variables for theme consistency */
+  body:not(.dark-theme) {
+    --fg-color: #000;
+    --bg-color: #fff;
+    --content-bg: #e0e0e0;
+    --content-fg: #000;
+    --content-hover-bg: #adadad;
+    --content-hover-fg: #000;
+  }
+
+  body.dark-theme {
+    --fg-color: #fff;
+    --bg-color: #202020;
+    --content-bg: #4e4e4e;
+    --content-fg: #fff;
+    --content-hover-bg: #222;
+    --content-hover-fg: #fff;
+  }
+
+  /* Override Storybook's problematic & selector styles */
+  /* Reset only the specific properties that Storybook injects */
+  #storybook-root li+li,
+  #storybook-docs li+li {
+    margin: inherit;
+    padding: inherit;
   }
 </style>