chore: v2.8.13 — Artifacts reinstall/edit/installs, agent steps in chat, pick a local file to attach, Windows paths as links

- Chat: an Agent step shows its task, status and tool calls and opens its conversation in place; Windows paths (E:\…, C:/…) in replies open as files
- Prompt: attach a file on this computer by path (native picker), clearer too-large messages
- Artifacts: edit title/description and a skill's files (new snapshot), Reinstall, install history, Hub-only rows, skills installed into ~/.claude/skills and ~/.agents/skills
- Files: batch upload of small files in one extract
- AI Tools: npm install falls back to --prefix ~/.local when the global prefix is not writable

client/src/components/run/__tests__/ChatAddMenu.test.tsx

@@ -2,13 +2,14 @@
  * @file ChatAddMenu.test.tsx
  * @description The `+` menu's existing-resource pickers: Project files (a
  * search with folders, attached as `@path`), the workspace's Context files
- * (files only, none missing) and this browser's Recent uploads.
+ * (files only, none missing), this browser's Recent uploads and, for a
+ * browser on the dashboard's machine, a file chosen in the OS's own picker.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
 import { fireEvent, render, screen } from "@testing-library/react";
 import { MemoryRouter } from "react-router-dom";
-import { beforeEach, describe, expect, it, vi } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import i18n from "i18next";
 import { ChatAddMenu } from "../ChatAddMenu";
 import { api } from "../../../lib/api";
@@ -21,6 +22,7 @@ vi.mock("../../../lib/api", async (importOriginal) => {
     api: {
       run: { files: vi.fn().mockResolvedValue({ items: ["src/", "src/a.ts"] }) },
       lanes: {
+        pickPath: vi.fn().mockResolvedValue({ path: "/home/u/Videos/demo clip.mp4" }),
         sources: vi.fn().mockResolvedValue({
           sources: [
             { id: 1, kind: "file", path: "/data/ctx/1/brief.md", name: "brief.md", missing: false },
@@ -61,6 +63,28 @@ beforeEach(() => {
   vi.clearAllMocks();
 });
 
+afterEach(() => vi.unstubAllGlobals());
+
+describe("ChatAddMenu — a file on this computer", () => {
+  it("attaches the file the OS picker chose by its path, uploading nothing", async () => {
+    const onAttach = renderMenu();
+    fireEvent.click(screen.getByTestId("chat-add-pick-local"));
+    expect(api.lanes.pickPath).toHaveBeenCalledWith("file", "/repo");
+    await vi.waitFor(() =>
+      expect(onAttach).toHaveBeenCalledWith([
+        { path: '@"/home/u/Videos/demo clip.mp4"', name: "demo clip.mp4" },
+      ])
+    );
+  });
+
+  it("is not offered to a browser on another machine", () => {
+    // Only a loopback address: a name that merely starts with "localhost" is not one.
+    vi.stubGlobal("location", { ...window.location, hostname: "localhost.example.com" });
+    renderMenu();
+    expect(screen.queryByTestId("chat-add-pick-local")).toBeNull();
+  });
+});
+
 describe("ChatAddMenu — existing resources", () => {
   it("searches the project, folders included, and attaches a pick as @path", async () => {
     const onAttach = renderMenu();