Summary

• Remove query_plan_text/query_plan from drill-down SELECTs (was loading 122 MB inline, hanging the app)
• Add on-demand plan fetch via Download button for all three drill-down types
• Pass parent view's time range through to drill-down queries so they respect the selected hour/date filter
• Aggregate query_stats drill-down by collection_time with MAX for cumulative counters (matches report.query_stats_summary)
• Aggregate query_store drill-down by collection_time + plan_id with weighted averages
• Remove broken 7-day DATEADD filter from PR Add 7-day time filter to drill-down queries (#165) #179 that prevented drill-downs from returning data
• Fix Download button: RowHeight 30->35, remove stale IsEnabled binding
• Fix DefaultTraceContent/CurrentConfigContent StaticResource -> DynamicResource
• Add upgrade script for memory_stats columns (1.2.0 -> 1.3.0)

Test plan

• Open Query Stats tab, double-click a row — drill-down loads, respects time range
• Open Query Store tab, double-click a row — drill-down loads with per-plan chart lines
• Open Procedure Stats tab, double-click a row — drill-down loads
• Click Download button in any drill-down — fetches plan on demand, save dialog works
• Switch time range buttons (1h, 8h, 7d) and verify drill-down row counts change accordingly
• Verify execution counts in drill-down are consistent with main view

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