fix: ruff findings

src/fenris/tui.py

@@ -12,7 +12,6 @@ Criteria: TUI-1, TUI-2, TUI-4, CI-1, CI-2, CI-4, IN-3, LC-6, LC-8.
 from __future__ import annotations
 
 import sqlite3
-import sys
 from datetime import date, datetime, timedelta, timezone
 from pathlib import Path
 from typing import Any, Callable, Dict, List, Optional
@@ -21,7 +20,7 @@ from zoneinfo import ZoneInfo
 from rich.text import Text
 from textual.app import App, ComposeResult
 from textual.binding import Binding
-from textual.containers import Container, Horizontal, VerticalScroll
+from textual.containers import Container, VerticalScroll
 from textual.screen import ModalScreen
 from textual.message import Message
 from textual.widget import Widget
@@ -38,16 +37,14 @@ from .activity_plot import VolumePoint, volume_plot
 from .projection import (
     ConfidenceState,
     ProjectionResult,
-    ScenarioRange,
     compute_projection,
 )
 from .status import (
     CADENCE_DEFAULT_S,
-    FRESH_THRESHOLD_S,
-    STALENESS_THRESHOLD_S,
+    FRESH_THRESHOLD_S,  # noqa: F401 -- re-exported; tests/test_acceptance_sweep.py asserts parity with status
+    STALENESS_THRESHOLD_S,  # noqa: F401 -- re-exported (see above)
     format_disclosures,
-    freshness_age_human,
-    grade_freshness,
+    grade_freshness,  # noqa: F401 -- re-exported (see above)
     deliberate_pause_lines,
     read_status,
     _journalctl_hint,
@@ -55,7 +52,6 @@ from .status import (
 from .status_composition import (
     StatusComposition,
     render_status_tui,
-    STATUS_POLL_INTERVAL_S,
 )
 from .control import MONITOR_HELPER, MonitorError, run_monitor
 from .derive import _parse_ts
@@ -1110,10 +1106,10 @@ def _query_local_day_graph_data(
         (start_text, end_text, selected_date or ""),
     ).fetchall()
     recorded_zones: Dict[str, list[str]] = {}
-    for local_date, timezone in rows:
+    for local_date, zone_name in rows:
         recorded_zones.setdefault(local_date, [])
-        if timezone not in recorded_zones[local_date]:
-            recorded_zones[local_date].append(timezone)
+        if zone_name not in recorded_zones[local_date]:
+            recorded_zones[local_date].append(zone_name)
 
     result: List[Dict[str, Any]] = []
     for local_date in sorted(local_dates):
@@ -1138,9 +1134,9 @@ def _query_local_day_graph_data(
             })
             continue
 
-        for timezone in timezones:
+        for zone_name in timezones:
             summary = query_local_day_summary(
-                conn, local_date, timezone, now,
+                conn, local_date, zone_name, now,
             )
             if summary is None:
                 continue