fix: resolve CI lint failures (F401, F541, F841)

shellhist/cli/time_analysis.py

@@ -1,12 +1 @@
-"""Time-based analysis command."""
-
-from collections import defaultdict
-from datetime import datetime, timedelta
-from typing import Optional
-
-import click
-from rich.console import Console
-from rich.table import Table
-
-from shellhist.core import HistoryLoader
-from shellhist.utils import format_timestamp
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