feat(FN-3398): update desktop README with multi-project setup and troublesh

The merge lands Step 7 of FN-3398, adding documentation and delivery artifacts across the mobile and desktop packages with updated READMEs, mobile-specific docs, and architecture references.

Fusion-Task-Id: FN-3398

packages/dashboard/app/components/__tests__/NativeShellConnectionStatus.test.tsx

@@ -0,0 +1,29 @@
+import { fireEvent, render, screen } from "@testing-library/react";
+import { describe, expect, it, vi } from "vitest";
+import { NativeShellConnectionStatus } from "../NativeShellConnectionStatus";
+
+describe("NativeShellConnectionStatus", () => {
+  it("shows local label for desktop local mode", () => {
+    render(
+      <NativeShellConnectionStatus
+        state={{ host: "desktop-shell", desktopMode: "local", activeProfileId: null, profiles: [] }}
+        onManage={vi.fn()}
+      />,
+    );
+
+    expect(screen.getByText("Local Fusion")).toBeInTheDocument();
+  });
+
+  it("opens manager when clicked", () => {
+    const onManage = vi.fn();
+    render(
+      <NativeShellConnectionStatus
+        state={{ host: "mobile-shell", activeProfileId: "p1", profiles: [{ id: "p1", name: "Prod", serverUrl: "https://fusion.example.com", createdAt: "", updatedAt: "" }] }}
+        onManage={onManage}
+      />,
+    );
+
+    fireEvent.click(screen.getByTestId("native-shell-status-btn"));
+    expect(onManage).toHaveBeenCalledTimes(1);
+  });
+});