fix: Add dark mode hover states to demo tabs

- Add dark:hover:text-gray-200 and dark:hover:border-gray-600 to tab hover states
- Prevents tabs from having light-colored hover states in dark mode
- Ensures consistent dark theme experience across all interactive elements

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ryanrozich

src/demo/components-showcase-complete.tsx

@@ -7165,7 +7165,7 @@ const handleFilterSelect = async (option) => {
                   className={`py-2 px-1 border-b-2 font-medium text-sm transition-colors ${
                     activeDemoTab === "client"
                       ? "border-indigo-500 text-white"
-                      : "border-transparent text-gray-400 hover:text-gray-300 hover:border-gray-300"
+                      : "border-transparent text-gray-400 hover:text-gray-300 hover:border-gray-300 dark:hover:text-gray-200 dark:hover:border-gray-600"
                   }`}
                 >
                   Client-Side Data
@@ -7175,7 +7175,7 @@ const handleFilterSelect = async (option) => {
                   className={`py-2 px-1 border-b-2 font-medium text-sm transition-colors ${
                     activeDemoTab === "server"
                       ? "border-indigo-500 text-white"
-                      : "border-transparent text-gray-400 hover:text-gray-300 hover:border-gray-300"
+                      : "border-transparent text-gray-400 hover:text-gray-300 hover:border-gray-300 dark:hover:text-gray-200 dark:hover:border-gray-600"
                   }`}
                 >
                   Server-Side Data
@@ -7188,7 +7188,7 @@ const handleFilterSelect = async (option) => {
                   className={`py-2 px-1 border-b-2 font-medium text-sm transition-colors ${
                     activeDemoTab === "presets"
                       ? "border-indigo-500 text-white"
-                      : "border-transparent text-gray-400 hover:text-gray-300 hover:border-gray-300"
+                      : "border-transparent text-gray-400 hover:text-gray-300 hover:border-gray-300 dark:hover:text-gray-200 dark:hover:border-gray-600"
                   }`}
                 >
                   Filter Presets