mesh: persist destination (to) on captured rx history records

src/mesh/mesh.service.ts

@@ -37,7 +37,7 @@ export interface MessageRecord {
   dir: 'rx' | 'tx';
   /** sender node num — rx only */
   from?: number;
-  /** destination node num (broadcast addr for broadcasts) — tx only */
+  /** destination node num (broadcast addr for broadcasts) — captured rx packets and all tx records */
   to?: number;
   text: string;
   channel: number;
@@ -626,6 +626,7 @@ export class MeshService implements OnModuleInit, OnModuleDestroy {
             id: pkt.id,
             dir: 'rx',
             from: pkt.from,
+            to: pkt.to, // destination (broadcast addr for broadcasts) — lets a later reply tell DM vs broadcast apart
             text,
             channel: pkt.channel ?? 0,
             at: Date.now(),