Fix managed mode WebSocket URL when server_url uses https://

The URL builder was prepending wss:// to the full https:// URL, producing
an invalid wss://https://... URL. Now properly converts https→wss and
http→ws before appending the /ws/transcribe path.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client/deepgram_transcription.py

@@ -320,9 +320,13 @@ class DeepgramTranscriptionEngine:
     def _build_ws_url_and_headers(self):
         """Return ``(url, headers)`` depending on the current mode."""
         if self.mode == "managed":
-            # Ensure the server URL uses wss:// and append the path
+            # Convert HTTP(S) URLs to WS(S) for WebSocket connection
             url = self.server_url.rstrip("/")
-            if not url.startswith("ws://") and not url.startswith("wss://"):
+            if url.startswith("https://"):
+                url = "wss://" + url[len("https://"):]
+            elif url.startswith("http://"):
+                url = "ws://" + url[len("http://"):]
+            elif not url.startswith("ws://") and not url.startswith("wss://"):
                 url = f"wss://{url}"
             url = f"{url}/ws/transcribe"
             return url, {}