fix(visualizer): sync state and re-subscribe from audio device load

- Broaden audio import errors from ImportError to Exception, log at warning
- Move visualizer WS re-subscription into loadAudioDevices() so it runs
  after availability is confirmed from the API
- Show/hide the visualizer toggle button based on fetched availability

media_server/services/audio_analyzer.py

@@ -17,8 +17,8 @@ def _load_numpy():
         try:
             import numpy as np
             _np = np
-        except ImportError:
-            logger.info("numpy not installed - audio visualizer unavailable")
+        except Exception as e:
+            logger.warning("numpy unavailable - audio visualizer disabled: %s", e)
     return _np
 
 
@@ -28,8 +28,8 @@ def _load_soundcard():
         try:
             import soundcard as sc
             _sc = sc
-        except ImportError:
-            logger.info("soundcard not installed - audio visualizer unavailable")
+        except Exception as e:
+            logger.warning("soundcard unavailable - audio visualizer disabled: %s", e)
     return _sc