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/NativeShellConnectionStatus.tsx

@@ -0,0 +1,22 @@
+import type { ShellConnectionState } from "../types/native-shell";
+import "./NativeShellConnectionStatus.css";
+
+interface NativeShellConnectionStatusProps {
+  state: ShellConnectionState;
+  onManage: () => void;
+}
+
+export function NativeShellConnectionStatus({ state, onManage }: NativeShellConnectionStatusProps) {
+  const activeProfile = state.profiles.find((profile) => profile.id === state.activeProfileId) ?? null;
+  const label =
+    state.host === "desktop-shell" && state.desktopMode === "local"
+      ? "Local Fusion"
+      : activeProfile?.name ?? "Disconnected";
+
+  return (
+    <button type="button" className="btn native-shell-status" onClick={onManage} data-testid="native-shell-status-btn">
+      <span className={`status-dot ${activeProfile || state.desktopMode === "local" ? "status-dot--online" : "status-dot--error"}`} aria-hidden="true" />
+      <span className="native-shell-status__label">{label}</span>
+    </button>
+  );
+}