refactor: reorganize Financials toolbar and flatten UI

- Group toolbar controls by function (Statement, Period, Mode, Scale)
- Move Trend Chart above Matrix, hidden by default
- Add chart toggle to toolbar actions
- Flatten all sections: remove card styling, use subtle dividers
- Update StatementRowInspector and NormalizationSummary with flat layout

components/dashboard/index-card-row.tsx

@@ -10,6 +10,8 @@ type IndexCardProps = {
   positive?: boolean;
 };
 
+export type { IndexCardProps };
+
 type IndexCardRowProps = {
   cards: IndexCardProps[];
   className?: string;