feat: Add playlist management functionality and compliance checks

- Introduced a new "Playlists" column in results view with visual indicators for membership.
- Added `playlist_api.py` to handle playlist-related operations (fetch, add, remove tracks).
- Implemented `PlaylistManagerDialog` for seamless playlist addition/removal with caching.
- Integrated compliance check script (`check_agents_compliance.py`) for ensuring coding standards.
- Added extensive documentation (`playlist_membership_manager.md`) covering architecture and flow.
- Updated GUI logic and QStandardItemModel setup to include playlist data.
- Included unit tests for playlist management components and API.

tidal_dl_ng/logger.py

@@ -47,6 +47,30 @@ class QtHandler(logging.Handler):
             XStream.stdout().write("%s\n" % record)
 
 
+# --- Verbosity control -------------------------------------------------------
+# If False: DEBUG and WARNING messages are suppressed (INFO/ERROR/CRITICAL shown).
+# If True: DEBUG and WARNING messages are shown.
+_VERBOSE_DEBUG = False
+
+
+class DebugWarningFilter(logging.Filter):
+    def filter(self, record: logging.LogRecord) -> bool:
+        # Always allow INFO (and above except WARNING handled below)
+        # Suppress DEBUG and WARNING when _VERBOSE_DEBUG is False
+        if not _VERBOSE_DEBUG and record.levelno in (logging.DEBUG, logging.WARNING):
+            return False
+        return True
+
+
+def enable_debug_and_warnings(enabled: bool = True):
+    """Enable/disable showing DEBUG and WARNING log records globally.
+
+    INFO/ERROR/CRITICAL are unaffected and always shown.
+    """
+    global _VERBOSE_DEBUG
+    _VERBOSE_DEBUG = bool(enabled)
+
+
 logger_gui = logging.getLogger(__name__)
 handler_qt: QtHandler = QtHandler()
 # log_fmt: str = "[%(asctime)s] %(levelname)s: %(message)s"
@@ -57,6 +81,8 @@ level_styles = coloredlogs.DEFAULT_LEVEL_STYLES.copy()
 level_styles["info"] = {"color": "green"}
 formatter = coloredlogs.ColoredFormatter(fmt=log_fmt, level_styles=level_styles)
 handler_qt.setFormatter(formatter)
+# Apply filter to control DEBUG/WARNING visibility
+handler_qt.addFilter(DebugWarningFilter())
 logger_gui.addHandler(handler_qt)
 logger_gui.setLevel(logging.DEBUG)
 
@@ -64,5 +90,7 @@ logger_cli = logging.getLogger(__name__)
 handler_stream: logging.StreamHandler = logging.StreamHandler()
 formatter = coloredlogs.ColoredFormatter(fmt=log_fmt, level_styles=level_styles)
 handler_stream.setFormatter(formatter)
+# Apply filter to control DEBUG/WARNING visibility
+handler_stream.addFilter(DebugWarningFilter())
 logger_cli.addHandler(handler_stream)
 logger_cli.setLevel(logging.DEBUG)