[fix](trx-client): speed up remote spectrum polling

Raise remote spectrum polling from 100 ms to 50 ms while keeping the relaxed timeout and subscriber gating.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/src/remote_client.rs

@@ -42,10 +42,9 @@ impl RemoteEndpoint {
     }
 }
 
-// Remote spectrum snapshots do not need to outpace the SDR-side producer.
-// Polling at ~10 Hz avoids stacking unnecessary in-flight requests on slower
-// links while still matching the typical backend update cadence.
-const SPECTRUM_POLL_INTERVAL: Duration = Duration::from_millis(100);
+// Keep remote spectrum reasonably responsive without returning to the old
+// timeout churn caused by a much tighter request cadence.
+const SPECTRUM_POLL_INTERVAL: Duration = Duration::from_millis(50);
 
 #[derive(Clone)]
 pub struct RemoteClientConfig {