Fix case-study share chrome, hero lockup width, and copy confirmation in the share dialog.

Marketing pages omitted create-flow nav copy, so Share rendered as a translation key; the case-study banner squeezed hero text to the thumbnail width; Copy link had no hover or copied state.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/pages/use-cases-completed-rule.test.jsx

@@ -1,9 +1,12 @@
 import { describe, test, expect, vi } from "vitest";
-import { screen } from "@testing-library/react";
+import { screen, render as rtlRender } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import { renderWithProviders as render } from "../utils/test-utils";
+import { MessagesProvider } from "../../app/contexts/MessagesContext";
 import UseCaseCompletedRulePage from "../../app/(marketing-case-study)/use-cases/[slug]/rule/page";
 import messages from "../../messages/en/index";
+import marketingMessages from "../../messages/en/marketing";
+import { getTranslation } from "../../lib/i18n/getTranslation";
 import { USE_CASE_DETAIL_SLUGS } from "../../lib/useCaseSyntheticPost";
 
 const mockPush = vi.fn();
@@ -83,9 +86,31 @@ describe("UseCaseCompletedRulePage", () => {
           name: messages.pages.useCasesCompletedRule.topNav.duplicateAriaLabel,
         }),
       ).toBeInTheDocument();
+      expect(screen.getByRole("button", { name: "Share" })).toBeInTheDocument();
     },
   );
 
+  test("marketing message bundle resolves Share (not the dotted create.topNav key)", () => {
+    expect(getTranslation(marketingMessages, "create.topNav.share")).toBe(
+      "Share",
+    );
+  });
+
+  test("Share button reads Share under the marketing case-study bundle", async () => {
+    rtlRender(
+      <MessagesProvider messages={marketingMessages}>
+        {await UseCaseCompletedRulePage({
+          params: Promise.resolve({ slug: "mutual-aid-colorado" }),
+        })}
+      </MessagesProvider>,
+    );
+
+    expect(screen.getByRole("button", { name: "Share" })).toBeInTheDocument();
+    expect(
+      screen.queryByRole("button", { name: "create.topNav.share" }),
+    ).not.toBeInTheDocument();
+  });
+
   test("Duplicate opens login when signed out", async () => {
     const user = userEvent.setup();
     mockOpenLogin.mockClear();