feat(analytics): fallback KPI delta comparison to last active period

[romahawk]

Summary

• Improves KPI deltas by falling back to the nearest earlier period with data when immediate previous window is empty.
• Adds explicit delta source labels to improve interpretability.

Changes

• src/pages/Dashboard.jsx
  • Added backward comparison-window search (up to 6 windows).
  • Emits comparison source: prev, last_active, or none.
• src/pages/dashboard/AnalyticsSection.jsx
  • Wires comparison KPI/source into KPI tiles.
• src/components/KpiTiles.jsx
  • Renders delta labels as vs prev or vs last active.
  • Keeps n/a when no baseline exists.

Validation

• npm run lint
• npm run build
• Visual checks:
  • normal windows show vs prev
  • sparse windows show vs last active
  • no historical data shows n/a

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Project	Deployment	Actions	Updated (UTC)
smartshooter	Ready	Preview, Comment	Feb 15, 2026 6:56pm