fix: playlist truncation overflow and align logging across plugins

- Fix format_playlist truncation: +4 → +5 to account for ", ..." suffix
- Add API error logging to all Sopel command handlers (matching Limnoria)
- Add long-track truncation test case

Made-with: Cursor

tests/test_plugin_helpers.py

@@ -90,9 +90,9 @@ def format_playlist(data: dict) -> str:
     parts: list[str] = []
     length = len(prefix)
     for t in tracks:
-        entry = f"{t.get("title", "")} by {t.get("artist", "")}"
+        entry = f"{t.get('title', '')} by {t.get('artist', '')}"
         sep = ", " if parts else ""
-        if length + len(sep) + len(entry) + 4 > _MAX_IRC_LINE:
+        if length + len(sep) + len(entry) + 5 > _MAX_IRC_LINE:  # +5 for ", ..."
             parts.append("...")
             break
         parts.append(entry)
@@ -197,7 +197,7 @@ class TestFormatPlaylist:
         data = {"tracks": [{"title": "A", "artist": "B"}]}
         assert format_playlist(data).startswith("Episode ?")
 
-    def test_truncation(self):
+    def test_truncation_many_tracks(self):
         tracks = [
             {"title": f"Track{i:03d} With A Longer Name", "artist": f"Artist{i:03d}"}
             for i in range(50)
@@ -207,6 +207,15 @@ class TestFormatPlaylist:
         assert len(result) <= _MAX_IRC_LINE
         assert result.endswith("...")
 
+    def test_truncation_long_single_track(self):
+        tracks = [
+            {"title": "A" * 200, "artist": "B" * 200},
+            {"title": "Second", "artist": "Track"},
+        ]
+        data = {"episode_number": 1, "tracks": tracks}
+        result = format_playlist(data)
+        assert len(result) <= _MAX_IRC_LINE
+
 
 # ---------------------------------------------------------------------------
 # _api_get