refactor: restructure into package layout and split large modules

auditui/stats/format.py

@@ -0,0 +1,22 @@
+"""Time and date formatting for stats display."""
+
+from datetime import datetime
+
+
+def format_time(milliseconds: int) -> str:
+    total_seconds = int(milliseconds) // 1000
+    hours, remainder = divmod(total_seconds, 3600)
+    minutes, _ = divmod(remainder, 60)
+    if hours > 0:
+        return f"{hours}h{minutes:02d}"
+    return f"{minutes}m"
+
+
+def format_date(date_str: str | None) -> str:
+    if not date_str:
+        return "Unknown"
+    try:
+        dt = datetime.fromisoformat(date_str.replace("Z", "+00:00"))
+        return dt.strftime("%Y-%m-%d")
+    except ValueError:
+        return date_str