Added tab visibility context and provider for dynamic tab management

- Introduced TabVisibilityProvider component
- Created TabContent for conditional rendering
- Added context and hooks for tab visibility
- Updated DocumentManager dependencies
- Integrated provider in App component

lightrag_webui/src/contexts/useTabVisibility.ts

@@ -0,0 +1,17 @@
+import { useContext } from 'react';
+import { TabVisibilityContext } from './context';
+import { TabVisibilityContextType } from './types';
+
+/**
+ * Custom hook to access the tab visibility context
+ * @returns The tab visibility context
+ */
+export const useTabVisibility = (): TabVisibilityContextType => {
+  const context = useContext(TabVisibilityContext);
+  
+  if (!context) {
+    throw new Error('useTabVisibility must be used within a TabVisibilityProvider');
+  }
+  
+  return context;
+};