fix: remove as-any casts, type Dashboard data properly

- Route handlers: add exhaustive return after error checks so TypeScript
  narrows the union and result properties are accessible without casts
- attendance.service: use Prisma.attendanceGetPayload for included relations
- projects.service: remove unnecessary cast on orders relation
- Dashboard.tsx: replace Record<string,any> with proper DashData interface

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/routes/admin/invoices.ts

@@ -160,6 +160,7 @@ export default async function invoicesRoutes(
             `Neplatný přechod stavu z "${result.currentStatus}" na "${result.newStatus}"`,
             400,
           );
+        return error(reply, "Neznámá chyba", 500);
       }
 
       await logAudit({
@@ -168,7 +169,7 @@ export default async function invoicesRoutes(
         action: "update",
         entityType: "invoice",
         entityId: id,
-        description: `Upravena faktura ${(result as any).invoice_number}`,
+        description: `Upravena faktura ${result.invoice_number}`,
       });
       return success(reply, { id }, 200, "Faktura byla aktualizována");
     },