fix(dashboard): show account card balance as net worth contribution

The card must keep liabilities negative (existing behaviour, covered by
deriveAccountMetrics tests); only the asset sign was buggy. Use
netWorthContribution instead of the raw balance so loans/credit cards stay
negative while a negative asset (e.g. overdrawn checking) is no longer
flipped positive.

resources/js/hooks/use-dashboard-data.ts

@@ -1,4 +1,5 @@
 import { useLocale } from '@/hooks/use-locale';
+import { netWorthContribution } from '@/lib/chart-calculations';
 import { Account, AccountType, Bank } from '@/types/account';
 import { Category } from '@/types/category';
 import { formatMonthFromYearMonth } from '@/utils/date';
@@ -74,7 +75,10 @@ export function deriveAccountMetrics(
             date: formatMonthFromYearMonth(point.month as string, locale),
             value:
                 typeof point[account.id] === 'number'
-                    ? (point[account.id] as number)
+                    ? netWorthContribution(
+                          account.type,
+                          point[account.id] as number,
+                      )
                     : 0,
             investedAmount:
                 investedKey in point