Fix post-rebase type errors in subscriber and encoder

Remove unused #closed field in subscriber.ts and fix Bandwidth type
usage in encoder.ts (Bandwidth is Signal directly, not a wrapper).

https://claude.ai/code/session_01C68pEkoUhQqtQALYxRajhx

Author: claude

js/lite/src/lite/subscriber.ts

@@ -203,8 +203,6 @@ export class Subscriber {
 		}
 	}
 
-	#closed = false;
-
 	/**
 	 * Opens a PROBE bidi stream to receive bandwidth estimates from the publisher.
 	 * Returns immediately if recv bandwidth is not supported.
@@ -227,7 +225,6 @@ export class Subscriber {
 	}
 
 	close() {
-		this.#closed = true;
 		for (const track of this.#subscribes.values()) {
 			track.close();
 		}

js/publish/src/video/encoder.ts

@@ -217,7 +217,7 @@ export class Encoder {
 				const conn = effect.get(this.connection);
 				const sendBw = conn?.sendBandwidth;
 				if (sendBw) {
-					const estimate = effect.get(sendBw.signal);
+					const estimate = effect.get(sendBw);
 					if (estimate != null) {
 						// Reserve ~10% for audio and protocol overhead.
 						const cap = Math.round(estimate * 0.9);