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/Combobox.dom.test.tsx

@@ -205,31 +205,6 @@ describe("Combobox", () => {
     expect(onChange).toHaveBeenCalledWith(["id1"]); // single-select replaces
   });
 
-  it("shows the any/all match footer only at 2+ selections and reports a mode change", () => {
-    // The per-category any/all toggle: meaningless below 2 selections (any === all), so it appears
-    // only at >= 2, and clicking 'all' reports the mode change out.
-    const onMatchModeChange = vi.fn();
-    const props = {
-      label: "Topic",
-      options: OPTIONS,
-      onChange: vi.fn(),
-      matchMode: "or" as const,
-      onMatchModeChange,
-    };
-    // One selection: no footer.
-    const { rerender } = wrap(<Combobox {...props} selected={["Drama"]} />);
-    fireEvent.focus(screen.getByRole("combobox"));
-    expect(screen.queryByText("sidebar.all")).toBeNull();
-
-    // Two selections: footer appears with an any/all segment.
-    rerender(<FloatingTree>{<Combobox {...props} selected={["Drama", "Action"]} />}</FloatingTree>);
-    fireEvent.focus(screen.getByRole("combobox"));
-    const all = screen.getByText("sidebar.all");
-    expect(all).toBeTruthy();
-    fireEvent.click(all);
-    expect(onMatchModeChange).toHaveBeenCalledWith("and");
-  });
-
   it("single-select: picking replaces the value and closes the list", () => {
     const onChange = vi.fn();
     wrap(