fix: Playlists Pagination + Player Fehlermeldungen

- Playlists: Alle werden jetzt geladen (Pagination)
- Player: Fehlermeldung wenn kein Geraet aktiv
- next/previous/repeat/shuffle zeigen Fehler statt stillschweigend zuversagen

spotify_cli/player.py

@@ -58,7 +58,7 @@ class Player:
 
     def toggle_play(self):
         if not self.current_playback:
-            return
+            raise Exception("Kein Wiedergabegeraet aktiv")
         if self.current_playback.get("is_playing"):
             self.client.pause()
         else:
@@ -67,11 +67,15 @@ class Player:
         self.refresh()
 
     def next(self):
+        if not self.current_playback:
+            raise Exception("Kein Wiedergabegeraet aktiv")
         self.client.next_track()
         time.sleep(0.5)
         self.refresh()
 
     def previous(self):
+        if not self.current_playback:
+            raise Exception("Kein Wiedergabegeraet aktiv")
         self.client.previous_track()
         time.sleep(0.5)
         self.refresh()
@@ -101,7 +105,7 @@ class Player:
 
     def toggle_repeat(self):
         if not self.current_playback:
-            return
+            raise Exception("Kein Wiedergabegeraet aktiv")
         state = self.current_playback.get("repeat_state", "off")
         new_state = "track" if state == "off" else "off"
         self.client.set_repeat(new_state)
@@ -109,7 +113,7 @@ class Player:
 
     def toggle_shuffle(self):
         if not self.current_playback:
-            return
+            raise Exception("Kein Wiedergabegeraet aktiv")
         state = not self.current_playback.get("shuffle_state", False)
         self.client.set_shuffle(state)
         self.refresh()