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/components/modals/Share.test.tsx

@@ -70,6 +70,43 @@ describe("Share modal", () => {
     expect(onClose).toHaveBeenCalledTimes(1);
   });
 
+  it("confirms Copy link with Copied! when the handler succeeds", async () => {
+    const user = userEvent.setup();
+    const onCopyLink = vi.fn().mockResolvedValue(true);
+    render(
+      <Share
+        isOpen={true}
+        onClose={vi.fn()}
+        {...noopHandlers}
+        onCopyLink={onCopyLink}
+      />,
+    );
+    await user.click(screen.getByRole("button", { name: "Copy link" }));
+    expect(onCopyLink).toHaveBeenCalledTimes(1);
+    expect(screen.getByRole("button", { name: "Copied!" })).toHaveAttribute(
+      "aria-pressed",
+      "true",
+    );
+    expect(screen.getByText("Link copied to clipboard")).toBeInTheDocument();
+  });
+
+  it("keeps Copy link when the handler reports failure", async () => {
+    const user = userEvent.setup();
+    render(
+      <Share
+        isOpen={true}
+        onClose={vi.fn()}
+        {...noopHandlers}
+        onCopyLink={vi.fn().mockResolvedValue(false)}
+      />,
+    );
+    await user.click(screen.getByRole("button", { name: "Copy link" }));
+    expect(screen.getByRole("button", { name: "Copy link" })).toBeInTheDocument();
+    expect(
+      screen.queryByRole("button", { name: "Copied!" }),
+    ).not.toBeInTheDocument();
+  });
+
   it("calls onClose when header overflow (more) is activated, matching modal chrome parity", async () => {
     const user = userEvent.setup();
     const onClose = vi.fn();