Adds three chart.js-backed KPI cards (Kassenstand-Verlauf, Einnahmen & Ausgaben, Top-10 offene Beitraege) to the existing Uebersicht page, consuming the new GET teams/:id/overview/stats endpoint via a new TeamStatsApi service. Introduces a small reusable ChartCanvas shared component that wraps the Chart.js instance lifecycle via @Input()/ ngOnChanges, following this codebase's existing input-decorator convention rather than effect(). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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