fix: ping-bot reply says "observers" not "stations"

Matches the term used everywhere else in CoreScope (/api/observers,
observer names, etc.) instead of an inconsistent synonym.

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

cmd/server/db.go

@@ -1969,10 +1969,10 @@ func (db *DB) GetChannelMessages(channelHash string, limit, offset int, region .
 	// pendingPing collects a ping-triggering message's REACH across every
 	// observation of it, not just the first: hops/snr/resolvedPath track
 	// the DEEPEST (max-hop) observation seen so far -- how far the packet
-	// had propagated before the farthest-along station heard it -- and
-	// observers is every distinct station that heard it at all (breadth).
+	// had propagated before the farthest-along observer heard it -- and
+	// observers is every distinct observer that heard it at all (breadth).
 	// A single arbitrary "first observation wins" data point understates
-	// both: two stations can hear the same flood at very different hop
+	// both: two observers can hear the same flood at very different hop
 	// depths depending on which relay leg reached them.
 	type pendingPing struct {
 		hops         int
@@ -2131,10 +2131,10 @@ func (db *DB) GetChannelMessages(channelHash string, limit, offset int, region .
 					repeaterNames = append(repeaterNames, *pk)
 				}
 			}
-			// Breadth: name the single station when there's only one (as
+			// Breadth: name the single observer when there's only one (as
 			// specific as before), otherwise report the count -- "heard by
-			// 4 stations" says more about actual reach than an arbitrarily
-			// picked single name once more than one station heard it.
+			// 4 observers" says more about actual reach than an arbitrarily
+			// picked single name once more than one observer heard it.
 			observerLabel := ""
 			switch len(p.observers) {
 			case 0:
@@ -2144,7 +2144,7 @@ func (db *DB) GetChannelMessages(channelHash string, limit, offset int, region .
 					observerLabel = name
 				}
 			default:
-				observerLabel = fmt.Sprintf("%d stations", len(p.observers))
+				observerLabel = fmt.Sprintf("%d observers", len(p.observers))
 			}
 			if m, ok := msgMap[txID]; ok {
 				m.Data["botReply"] = pingBotReply(p.hops, p.snr, observerLabel, p.scope, repeaterNames)

cmd/server/db_test.go

@@ -1492,11 +1492,11 @@ func TestGetChannelMessages_PingBotReply(t *testing.T) {
 }
 
 // TestGetChannelMessages_PingBotReply_MultiObservation covers a single
-// ping transmission heard by TWO different observer stations at
+// ping transmission heard by TWO different observers at
 // DIFFERENT hop depths (normal in a mesh: one station may hear an early
 // relay leg, another a later one). The botReply must report the DEEPEST
 // (max-hop) observation's path/SNR -- not whichever observation happened
-// to be scanned first -- and the breadth ("N stations") once more than
+// to be scanned first -- and the breadth ("N observers") once more than
 // one distinct station heard it, per pingBotReply's doc comment.
 func TestGetChannelMessages_PingBotReply_MultiObservation(t *testing.T) {
 	db := setupTestDB(t)
@@ -1542,8 +1542,8 @@ func TestGetChannelMessages_PingBotReply_MultiObservation(t *testing.T) {
 	if !strings.Contains(text, "via RepeaterAlpha → pkBravoRepeater → RepeaterCharlie") {
 		t.Errorf("botReply text = %q, want the deeper observation's resolved relay path", text)
 	}
-	if !strings.Contains(text, "heard by 2 stations") {
-		t.Errorf("botReply text = %q, want breadth reported as \"2 stations\" now that more than one station heard it", text)
+	if !strings.Contains(text, "heard by 2 observers") {
+		t.Errorf("botReply text = %q, want breadth reported as \"2 observers\" now that more than one observer heard it", text)
 	}
 }