Problem

The Overview section currently has separate top-level tabs for Server Config Changes, Database Config Changes, and Trace Flag Changes. These should be consolidated under a single "Configuration Changes" tab with sub-tabs, matching the pattern used by the new "Current Configuration" tab.

Current State

• Server Config Changes (standalone tab)
• Database Config Changes (standalone tab)
• Trace Flag Changes (standalone tab)

Proposed

• Configuration Changes (single tab)
  • Server Config Changes (sub-tab)
  • Database Config Changes (sub-tab)
  • Trace Flag Changes (sub-tab)

This reduces tab clutter in the Overview section and groups related functionality together.

Affected Files

• Dashboard/ServerTab.xaml — move the three change TabItems into a new UserControl
• New Dashboard/Controls/ConfigChangesContent.xaml and .xaml.cs
• Dashboard/ServerTab.xaml.cs — wire up the new UserControl