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/hooks/useShellConnection.ts

@@ -0,0 +1,5 @@
+import { useShellContext } from "../context/ShellContext";
+
+export function useShellConnection() {
+  return useShellContext();
+}