fix: resolve remaining ruff violations (FURB110, PLC0207)

- generate_blunder_tests.py: use 'or' instead of ternary (FURB110)
- music_generator.py: use 'or' instead of ternary (FURB110), fix type: ignore
- random_digits.py: use rsplit with maxsplit instead of split (PLC0207)

python_pkg/lichess_bot/tools/generate_blunder_tests.py

@@ -121,7 +121,7 @@ def extract_pgn(text: str) -> str | None:
         return None
     start = m.end()
     pgn = text[start:].strip()
-    return pgn if pgn else None
+    return pgn or None
 
 
 def san_list_from_game(game: chess.pgn.Game) -> list[str]:

python_pkg/music_gen/music_generator.py

@@ -17,6 +17,7 @@ import argparse
 from datetime import datetime, timezone
 from pathlib import Path
 import sys
+from typing import Any
 import warnings
 
 # Suppress warnings for cleaner output
@@ -161,7 +162,7 @@ def select_model_size(user_choice: str | None = None) -> str:
 
 def load_model(
     model_size: str = "medium",
-) -> tuple:  # type: ignore[type-arg]
+) -> tuple[Any, Any]:
     """Load the MusicGen model.
 
     Args:
@@ -327,7 +328,7 @@ def _split_into_sentences(text: str) -> list[str]:
     if current:
         result.append(current)
 
-    return result if result else [text]
+    return result or [text]
 
 
 def _resample_audio(

python_pkg/randomize_numbers/random_digits.py

@@ -61,7 +61,7 @@ def _parse_single_number(num_str: str) -> tuple[float, int] | None:
     """
     try:
         float_num = float(num_str)
-        digits_count = len(num_str.split(".")[-1]) if "." in num_str else 0
+        digits_count = len(num_str.rsplit(".", maxsplit=1)[-1]) if "." in num_str else 0
     except ValueError:
         return None
     return float_num, digits_count