layout and remote fix

src/lib/stores/playbackMode.ts

@@ -316,10 +316,31 @@ function createPlaybackModeStore() {
         const mode = event.payload.mode as PlaybackMode;
         const remoteSessionId =
           mode === "remote" ? event.payload.session_id ?? null : null;
+
+        // Ignore no-op re-broadcasts. The backend re-emits on every set_mode, and
+        // local playback drives set_mode("local") from BOTH the frontend
+        // (handleStateChanged) and Rust, so the same mode arrives repeatedly. If
+        // we reconciled unconditionally we'd re-run selectSession(null) on each
+        // one, deselecting the remote session mid-cast and tripping the
+        // disconnect-to-idle watchdog (breaking the lockscreen card, remote
+        // volume, and — via the resulting mode flap — local audio).
+        if (
+          currentState.mode === mode &&
+          currentState.remoteSessionId === remoteSessionId
+        ) {
+          return;
+        }
+
         console.log("[PlaybackMode] Backend mode changed →", mode, remoteSessionId);
         update((s) => ({ ...s, mode, remoteSessionId }));
-        // Keep the selected session in step so the merged UI stores follow.
-        sessions.selectSession(remoteSessionId);
+        // Keep the selected session in step so the merged UI stores follow, but
+        // only touch the selection when it actually differs — re-selecting the
+        // same id (or clearing on a non-remote emit that isn't a real change)
+        // would needlessly churn the session watchdog.
+        const selected = get(selectedSession);
+        if ((selected?.id ?? null) !== remoteSessionId) {
+          sessions.selectSession(remoteSessionId);
+        }
       }
     });