refactor: streamline debounced search implementation and enhance document type filter behavior

surfsense_web/app/dashboard/[search_space_id]/researcher/[chat_id]/page.tsx

@@ -436,24 +436,17 @@ const ChatPage = () => {
   const [documentsPerPage] = useState(10);
   const { documents, loading: isLoadingDocuments, error: documentsError } = useDocuments(Number(search_space_id));
 
-  // Custom hook for debounced search
+  // Debounced search effect (proper implementation)
-  const useDebounce = (value: string, delay: number) => {
   useEffect(() => {
     const handler = setTimeout(() => {
-        setDebouncedDocumentFilter(value);
+      setDebouncedDocumentFilter(documentFilter);
       setDocumentsPage(1); // Reset page when search changes
-      }, delay);
+    }, 300);
 
     return () => {
       clearTimeout(handler);
     };
-    }, [value, delay]);
+  }, [documentFilter]);
-
-    return debouncedDocumentFilter;
-  };
-
-  // Use debounced search
-  useDebounce(documentFilter, 300);
 
   // Memoized filtered and paginated documents
   const filteredDocuments = useMemo(() => {
@@ -1294,7 +1287,10 @@ const ChatPage = () => {
                                          {/* Document Type Filter */}
                      <DocumentTypeFilter
                        value={documentTypeFilter}
-                      onChange={setDocumentTypeFilter}
+                       onChange={(newType) => {
+                         setDocumentTypeFilter(newType);
+                         setDocumentsPage(1); // Reset to page 1 when filter changes
+                       }}
                        counts={documentTypeCounts}
                      />
                   </div>