feat(mesh): show federated Archipelago nodes on the Mesh Map

Peers that opt in via a new "Share Location" toggle in Settings
(server.set-location RPC) get plotted on other trusted peers' Mesh Map
with a distinct Archy-logo marker, separate from raw LoRa radio peers.
Location is persisted locally, carried in NodeStateSnapshot, and
propagated through federation sync/delta like other node state.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

neode-ui/src/views/Mesh.vue

@@ -130,6 +130,7 @@ async function refreshFederationNodes() {
       })
     }
     fedNodesByDid.value = next
+    mesh.updateFederatedPositions(res.nodes)
   } catch { /* non-fatal */ }
 }
 async function refreshSelfOnion() {