Wrap demo tab content in BeginChild to keep tabs visible when scrolling

[Copilot]

Tab bar scrolls out of view when viewing long content in ImGuiAppDemo, making tab navigation difficult at the bottom of pages.

Changes

Modified 14 demo files in examples/ImGuiAppDemo/Demos/ to wrap content in ImGui.BeginChild(), creating an independent scrollable region within each tab while keeping the tab bar fixed.

Pattern applied:

public void Render()
{
    if (ImGui.BeginTabItem(TabName))
    {
        if (ImGui.BeginChild("##content"))
        {
            // Content scrolls here
        }
        ImGui.EndChild();
        
        ImGui.EndTabItem();
    }
}

Files modified:

• BasicWidgetsDemo.cs
• AdvancedWidgetsDemo.cs
• AnimationDemo.cs
• CleanImNodesDemo.cs
• DataVisualizationDemo.cs
• GraphicsDemo.cs
• ImGuizmoDemo.cs
• ImNodesDemo.cs
• ImPlotDemo.cs
• InputHandlingDemo.cs
• LayoutDemo.cs
• NerdFontDemo.cs
• UnicodeDemo.cs
• UtilityDemo.cs

Also fixed typo in ImGuizmoDemo separator text.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Wrap demo.Render() in BeginChild()</issue_title>
<issue_description>Consider adding this to a BeginChild so the tabs are always visible, even when scrolled down the page so you can switch tab when you get to the end of the content?

Originally posted by @Damon3000s in #132 (comment)
</issue_description>

Comments on the Issue (you are @copilot in this section)

@matt-edmondson @copilot is this still required?

• Fixes Wrap demo.Render() in BeginChild() #133

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[sonarqubecloud]

Quality Gate failed

Failed conditions
22 Security Hotspots
0.0% Coverage on New Code (required ≥ 80%)
C Security Rating on New Code (required ≥ A)
C Reliability Rating on New Code (required ≥ A)

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