test(web): cover compact-layout expand toggle in HistoryEntry

Adds a test that clicks Expand/Collapse in the embedded (compact)
layout, exercising the ExpandToggle onToggle callback that was
uncovered (line 193). Restores HistoryEntry.tsx to 100% coverage,
fixing the CI per-file function-coverage gate failure (was 85.71%).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BrihGWcrM9JGRyu41nzZYw

clients/web/src/components/groups/HistoryEntry/HistoryEntry.test.tsx

@@ -280,6 +280,18 @@ describe("HistoryEntry", () => {
     ).toBeInTheDocument();
   });
 
+  it("toggles the local expand/collapse state when clicking Expand/Collapse in the compact layout", async () => {
+    const user = userEvent.setup();
+    renderWithMantine(
+      <HistoryEntry {...baseProps} entry={successEntry} embedded />,
+    );
+    expect(screen.getByRole("button", { name: "Expand" })).toBeInTheDocument();
+    await user.click(screen.getByRole("button", { name: "Expand" }));
+    expect(
+      screen.getByRole("button", { name: "Collapse" }),
+    ).toBeInTheDocument();
+  });
+
   it("starts expanded when isListExpanded is true and shows Parameters and Response", () => {
     renderWithMantine(
       <HistoryEntry