Summary

• Issue Consolidate config change tabs under a Configuration Changes tab #185: Consolidated Server Config Changes, Database Config Changes, and Trace Flag Changes into a single "Configuration Changes" tab with sub-tabs in Dashboard
• Issue [FEATURE] Option to drop PerformanceMonitor database when removing a server #201: Remove Server dialog now offers option to drop the PerformanceMonitor database on the remote SQL Server
• Issue Download plan button should use stored DuckDB copy before falling back to live server #219: Plan downloads check DuckDB cache first before falling back to live SQL Server (query stats, procedure stats, Query Store history)
• Issue Lite: Add lock waits trend chart to Blocking tab to match Dashboard #141: Lock waits trend chart added to Blocking > Trends tab in Lite, showing per-second rates for all LCK% wait types

Additional fixes discovered during testing

• Added 7 missing columns + Download Plan button to procedure stats grid
• Fixed plan download button text changing to "Save" instead of staying "Download"
• Filtered zero-activity rows from query/procedure stats with HAVING clause
• Fixed "System.Windows.Controls.StackPanel" appearing in clipboard copy headers (both Dashboard and Lite)

Test plan

• Dashboard: Configuration Changes tab shows three sub-tabs with correct data
• Dashboard: Remove Server dialog offers DB drop option, works with and without checkbox
• Lite: Lock wait trend chart renders multi-series data correctly
• Lite: Procedure stats grid shows all columns with non-zero data
• Lite: Plan downloads try DuckDB first, fall back to live server
• Both apps: Copy All Rows shows proper column headers, not StackPanel type names
• Both apps: Build succeeds with 0 errors, 0 warnings

Closes #185, #201, #219, #141

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