feat(debug): enhance linked list demo with item count and message output

feat(debug): improve GDB pretty-printer support for structured types
fix(debug): update dump_debug_graph script to reflect changes in main.cpp
feat(visualization): add type hint display to node table visualizer

cpp/main.cpp

@@ -55,16 +55,21 @@ private:
 
 int main() {
     LinkedList<int> list;
-
+    int count=0;
+    char * message1 = "hello world";
     // Demonstrate pushing items
     list.push_front(10);
+    count++;
     list.push_front(20);
+    count++;
     list.push_front(30);
+    count++;
 
     // Demonstrate peeking at the top item
     if (const int* top = list.peek_front()) {
-        std::cout << "Top element: " << *top << "\n"; // Output: 30
+        std::cout << "Top element: " << *top << "\n"<<"count: "<<count<<"\n"; // Output: 30
     }
+    std::cout<<message1<<"\n";
 
     // Demonstrate popping items
     while (auto value = list.pop_front()) {