feat(dashboard): real business metrics with week-over-week trends

Dashboard KPIs were three flat counters with no trend data — the cards
rendered a neutral dash where the design intends movement indicators.
Summary now queries three trailing windows and emits four KPIs with
real deltas: bookings this week, completed (new CompletedCount metric
in both repositories), cancellations, and utilization in percentage
points. KPI labels localize in the frontend via a code-to-key map so
Czech operators no longer see English labels on live data.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/frontend/src/routes/dashboard/dashboard-data.ts

@@ -211,8 +211,17 @@ export function DashboardDataProvider(props: { children: any }) {
     };
   };
 
+  const kpiLabelKeys: Record<string, string> = {
+    bookings_this_week: "dashboard.kpi.bookingsThisWeek",
+    completed: "dashboard.kpi.completed",
+    cancellations: "dashboard.kpi.cancellations",
+    utilization: "dashboard.kpi.utilization",
+  };
   const normalizedKpis = createMemo(() => (resolvedSummary()?.kpis ?? []).map((kpi: any) => ({
-    ...kpi, trend: kpi.trend ?? "neutral", change: kpi.change ?? "—",
+    ...kpi,
+    label: kpi.code && kpiLabelKeys[kpi.code] ? i18n.t(kpiLabelKeys[kpi.code]) : kpi.label,
+    trend: kpi.trend ?? "neutral",
+    change: kpi.change ?? "—",
   })));
 
   const normalizedUpcomingBookings = createMemo(() => (resolvedSummary()?.upcomingBookings ?? []).map((booking: any) => ({