LocalMeshActivity

The connected device's mesh Send/Receive activity stream, provided once at the app root (see MeshtasticAppShell).

The provided value is the Flow itself, not a collected value — its reference is stable, so providing it costs no recomposition. Collection happens only at the leaf that needs it (the local node's connection badge / nav icon), which animates in the draw phase. Providing a per-packet collected value here instead would recompose every reader. Null — the default before a device connects, and in previews/tests — falls back to the non-animated icon.