chore: add typed ESLint checks #18

Refs WealthLedger/main#18. Keep Biome; add no Prettier dependencies.

packages/ui/src/EntryCard/EntryCard.test.tsx

@@ -4,6 +4,22 @@ import { assert, describe, expect, it } from "vitest";
 import { EntryCard } from "./EntryCard";
 
 describe("EntryCard", () => {
+	it("does not leak a numeric zero from an absent action", () => {
+		render(
+			<MantineProvider>
+				<EntryCard
+					title="Пример"
+					metadata="Описание"
+					initial="У"
+					value="—"
+					valueLabel="Неизвестно"
+					tone="neutral"
+					actions={0}
+				/>
+			</MantineProvider>,
+		);
+		expect(screen.queryByText("0")).not.toBeInTheDocument();
+	});
 	it("keeps a failed image fallback until a new source is supplied", () => {
 		const props = {
 			title: "Пример",

packages/ui/src/EntryCard/EntryCard.tsx

@@ -58,7 +58,7 @@ const EntryCard: FC<EntryCardProps> = (props) => {
 					>
 						{props.valueLabel}
 					</Text>
-					{props.actions && (
+					{Boolean(props.actions) && (
 						<div className={classes.actions}>{props.actions}</div>
 					)}
 				</div>