fix(player): a description link keeps its sentence's punctuation and its own parentheses

The trailing .,;:!?)] was trimmed off the href and dropped from the text too, and a URL ending in a
balanced ")" (a Wikipedia article) was cut short. The trim keeps a closing paren that has its
opener, and the trimmed tail is put back after the link.

frontend/src/components/descriptionLinks.dom.test.tsx

@@ -0,0 +1,43 @@
+// @vitest-environment jsdom
+//
+// E28 review C6: a link at the end of a sentence lost the punctuation after it — the trailing
+// `.,;:!?)]` was trimmed off the href and then dropped from the text too — and a URL whose own path
+// ends in a balanced ")" (a Wikipedia article) was cut short and broken.
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { cleanup, render } from "@testing-library/react";
+import type { TFunction } from "i18next";
+
+import { renderDescription } from "./descriptionLinks";
+
+afterEach(cleanup);
+
+function shown(text: string) {
+  const { container } = render(
+    <div>
+      {renderDescription(text, {
+        currentId: "x",
+        onSeek: vi.fn(),
+        onLoadVideo: vi.fn(),
+        t: ((k: string) => k) as unknown as TFunction,
+      })}
+    </div>,
+  );
+  return {
+    text: container.textContent,
+    hrefs: [...container.querySelectorAll("a")].map((a) => a.getAttribute("href")),
+  };
+}
+
+describe("a link in a description", () => {
+  it("keeps the punctuation after it in the text, out of the link", () => {
+    const r = shown("See https://example.com/page. And (https://example.org/x), too!");
+    expect(r.text).toBe("See https://example.com/page. And (https://example.org/x), too!");
+    expect(r.hrefs).toEqual(["https://example.com/page", "https://example.org/x"]);
+  });
+
+  it("keeps a balanced parenthesis that belongs to the address", () => {
+    const r = shown("Read https://en.wikipedia.org/wiki/Mercury_(planet).");
+    expect(r.hrefs).toEqual(["https://en.wikipedia.org/wiki/Mercury_(planet)"]);
+    expect(r.text).toBe("Read https://en.wikipedia.org/wiki/Mercury_(planet).");
+  });
+});