fix(codex-config): close fix-round-1 parity gaps against CcConfig

Isolate the codex-CLI-backed reads (mcp/plugins/marketplaces) from the
file-backed ones in fetchAll via two independent Promise.all groups, so a
missing `codex` binary degrades only the mcp/plugins tabs instead of
leaving the whole panel stuck on skeletons. Generalize EditorModal's
nameless-type detection behind a `namelessTypes` prop (defaulting to
Claude's own ["memory"]) so Codex's config.toml can be created without a
name. Port BackupsModal, disable the plugin/mcp Remove button when no
stable identifier resolved, hide the inert search box on memory/config,
drop a redundant empty state, and reword the delete-dialog copy to be
tool-neutral.

Co-authored-by: Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>

client/src/pages/__tests__/CodexConfig.test.tsx

@@ -42,6 +42,7 @@ const codexConfigMock = vi.hoisted(() => {
     pluginAction: r({ ok: true, stdout: "", stderr: "" }),
     marketplaceAdd: r({ ok: true, stdout: "", stderr: "" }),
     marketplaceAction: r({ ok: true, stdout: "", stderr: "" }),
+    backups: r({ items: [] }),
   };
 });
 
@@ -124,4 +125,63 @@ describe("CodexConfig", () => {
 
     expect(write).toHaveBeenCalledWith(expect.objectContaining({ type: "rules", name: "default" }));
   });
+
+  it("keeps the file-backed tabs working when the codex CLI read rejects", async () => {
+    stubCodexApi({ skills: [{ scope: "user", name: "my-skill", file: "/s/my-skill", size: 3 }] });
+    codexConfigMock.mcp.mockRejectedValueOnce(new Error("the codex CLI was not found on PATH"));
+    render(<CodexConfig />);
+    await settle();
+
+    // No page-wide error banner - the CLI-backed rejection is isolated.
+    expect(screen.queryByText(/failed to load/i)).not.toBeInTheDocument();
+
+    // Pure file reads (skills) still rendered their data.
+    await userEvent.click(screen.getByRole("tab", { name: /skills/i }));
+    expect(screen.getByText("my-skill")).toBeInTheDocument();
+
+    // The CLI-owned tab degrades gracefully instead of spinning forever.
+    await userEvent.click(screen.getByRole("tab", { name: /mcp/i }));
+    expect(screen.getByText(/codex cli isn't available/i)).toBeInTheDocument();
+  });
+
+  it("creates a nameless-type artifact (config.toml) without requiring a name", async () => {
+    const write = vi.fn().mockResolvedValue({ file: "/c/config.toml", created: true });
+    stubCodexApi({ write });
+    render(<CodexConfig />);
+    await settle();
+
+    await userEvent.click(screen.getByRole("tab", { name: /config/i }));
+    const newButtons = screen.getAllByRole("button", { name: /new/i });
+    await userEvent.click(newButtons[0]!);
+    await settle();
+
+    // No name field, no client-side "Name" validation error blocking save.
+    expect(screen.queryByPlaceholderText(/name/i)).not.toBeInTheDocument();
+    await userEvent.click(screen.getByRole("button", { name: /save/i }));
+
+    expect(write).toHaveBeenCalledWith(
+      expect.objectContaining({ type: "config", name: undefined })
+    );
+  });
+
+  it("opens the backups modal and lists what the codex API returns", async () => {
+    codexConfigMock.backups.mockResolvedValueOnce({
+      items: [
+        {
+          type: "rules",
+          name: "default.2026-09-08.bak",
+          file: "/r/default.bak",
+          mtime: 0,
+          size: 3,
+        },
+      ],
+    });
+    render(<CodexConfig />);
+    await settle();
+
+    await userEvent.click(screen.getByRole("button", { name: /backups/i }));
+    await settle();
+
+    expect(screen.getByText("default.2026-09-08.bak")).toBeInTheDocument();
+  });
 });