Align the fetch-lyrics summary with fetch-artists via shared utils

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tools/src/pop_fem_audit_tools/utils.py

@@ -0,0 +1,24 @@
+# Tools for A Feminist Audit of Pop Music.
+# Copyright 2026 imacat.  All rights reserved.
+# Authors:
+#   imacat@mail.imacat.idv.tw (imacat), 2026/8/4
+"""The shared utilities of the package."""
+
+
+def format_duration(seconds: float) -> str:
+    """Format an elapsed duration for the closing summary line.
+
+    :param seconds: The elapsed duration, in seconds.
+    :return: The duration formatted ``mm:ss``, or ``h:mm:ss``
+        once it reaches one hour.
+    """
+    total: int = round(seconds)
+    hours: int
+    remainder: int
+    hours, remainder = divmod(total, 3600)
+    minutes: int
+    secs: int
+    minutes, secs = divmod(remainder, 60)
+    if hours > 0:
+        return f"{hours}:{minutes:02d}:{secs:02d}"
+    return f"{minutes:02d}:{secs:02d}"