feat: manual odometer baseline — Settings field computes baseline + trip distance, Dashboard shows (manual) label

modules/app_sql.py

@@ -457,6 +457,10 @@ def get_overview_stats():
         video_count = sum(1 for _ in _av.list_local_videos().get("files", []))
     except Exception:
         video_count = 0
+    from modules import app_settings
+    base = app_settings._number_value("odometer_baseline", float, 0)
+    cumul = conn.execute("SELECT COALESCE(SUM(DISTANCE_KM), 0) FROM trips").fetchone()
+    computed = base + (cumul[0] if cumul else 0)
     return {
         "trip_count": row[0],
         "total_km": row[1],
@@ -464,7 +468,8 @@ def get_overview_stats():
         "all_time_max_speed": row[3],
         "active_dtc": dtc_row[0] if dtc_row else 0,
         "video_count": video_count,
-        "odometer_km": odo_row[0] if odo_row and odo_row[0] else None,
+        "odometer_km": computed if base > 0 else (odo_row[0] if odo_row and odo_row[0] else None),
+        "odometer_source": "manual" if base > 0 else "obd",
     }