fix: update SQL query in recovery chart payloads for accurate date filtering

- Modified the SQL query in `build_vital_signs_matrix_chart_payload` to use `measured_at::date` for date comparisons, ensuring correct data retrieval based on the measurement date.
- Adjusted the order of results to sort by `measured_at` instead of `date`, improving the accuracy of the latest vital signs data fetched.

backend/data_layer/recovery_chart_payloads.py

@@ -377,8 +377,8 @@ def build_vital_signs_matrix_chart_payload(profile_id: str, days: int) -> Dict[s
         cur.execute(
             """SELECT systolic, diastolic
                FROM blood_pressure_log
-               WHERE profile_id=%s AND date >= %s
-               ORDER BY date DESC, time DESC
+               WHERE profile_id=%s AND measured_at::date >= %s::date
+               ORDER BY measured_at DESC
                LIMIT 1""",
             (profile_id, cutoff),
         )