feat(filters): the any/all switch sits on the panel above its picker

ui/MatchToggle replaces the Combobox popover footer (Feed tags, topics,
languages; Plex collections) and PlexSidebar's own toggle (genres,
actors): shown from two picks, one wording. A closed picker had hidden
that "all" was on.

frontend/src/components/ui/MatchToggle.dom.test.tsx

@@ -0,0 +1,27 @@
+// @vitest-environment jsdom
+import { describe, it, expect, vi, afterEach } from "vitest";
+import { render, screen, fireEvent, cleanup } from "@testing-library/react";
+
+vi.mock("react-i18next", () => ({ useTranslation: () => ({ t: (k: string) => k }) }));
+
+import MatchToggle from "./MatchToggle";
+
+afterEach(cleanup);
+
+// The any/all switch sits on the panel above its picker (the owner, 2026-09-27): shown from two
+// picks — with one, any and all are the same filter — as one named segment, the current mode pressed.
+describe("MatchToggle", () => {
+  it("draws nothing below two picks", () => {
+    const { container } = render(<MatchToggle picked={1} value="any" onChange={() => {}} />);
+    expect(container.innerHTML).toBe("");
+  });
+
+  it("from two picks: a named any/all group with the current mode pressed, reporting the pick", () => {
+    const onChange = vi.fn();
+    render(<MatchToggle picked={2} value="any" onChange={onChange} />);
+    const group = screen.getByRole("group", { name: "common.matchMode" });
+    expect(group.querySelector('[aria-pressed="true"]')?.textContent).toBe("common.match.any");
+    fireEvent.click(screen.getByRole("button", { name: "common.match.all" }));
+    expect(onChange).toHaveBeenCalledWith("all");
+  });
+});