fix: 修复多个UI框架问题

- 修复 InspectorPanel InputText 使用 data()/capacity() 的错误
- 修复未使用变量警告
- 修复 ProjectManager 路径重复拼接 bug (Assets/Assets)
- 返回按钮在 Assets 目录时禁用但保持显示
- 删除 ProjectPanel 创建按钮，调整 Refresh 位置
- 修复 ProjectPanel 搜索过滤时的 ID 冲突
- 修复 InspectorPanel CollapsingHeader ID 冲突

ui/src/panels/ProjectPanel.cpp

@@ -18,27 +18,24 @@ void ProjectPanel::Render() {
     
     auto& manager = ProjectManager::Get();
     
-    if (manager.CanNavigateBack()) {
-        if (ImGui::Button("<")) {
+    bool canGoBack = manager.CanNavigateBack();
+    ImGui::BeginDisabled(!canGoBack);
+    if (ImGui::Button("<")) {
+        if (canGoBack) {
             manager.NavigateBack();
         }
-        ImGui::SameLine();
     }
+    ImGui::EndDisabled();
+    ImGui::SameLine();
     
     ImGui::Text("%s", manager.GetCurrentPath().c_str());
     
     ImGui::SameLine();
-    ImGui::SetCursorPosX(ImGui::GetWindowWidth() - 140.0f);
+    ImGui::SetCursorPosX(ImGui::GetWindowWidth() - 80.0f);
     if (ImGui::Button("Refresh")) {
         manager.RefreshCurrentFolder();
     }
     
-    ImGui::SameLine();
-    if (ImGui::Button("+")) {
-        m_showCreateFolderPopup = true;
-        strcpy_s(m_newFolderName, "NewFolder");
-    }
-    
     ImGui::Separator();
     
     ImGui::PushItemWidth(-1);
@@ -69,7 +66,7 @@ void ProjectPanel::Render() {
         if (itemIndex > 0 && itemIndex % columns != 0) {
             ImGui::SameLine();
         }
-        RenderAssetItem(items[i], i);
+        RenderAssetItem(items[i], itemIndex);
         itemIndex++;
     }