feat(portfolio): add expanded layout for bond position cards

Add variant="bond" to PositionCard with bond-specific CSS classes
(.bondCard, .bondMain, etc.) matching the stock expanded layout.
PositionSection now passes variant based on section kind.
Bond cards render 3-column grid (logo | identity | value) with
meta row, identical to stock cards.

src/pages/account/ui/components/PositionSection.view.tsx

@@ -20,7 +20,13 @@ const PositionSection: FC<PositionSectionProps> = (props) => {
 						key={`${position.figi}-${position.displayName}-${position.quantity}`}
 						position={position}
 						wide={section.wide}
-						variant={section.kind === "stocks" ? "stock" : undefined}
+						variant={
+							section.kind === "stocks"
+								? "stock"
+								: section.kind === "bonds"
+									? "bond"
+									: undefined
+						}
 					/>
 				))}
 			</SimpleGrid>