feat: replay duration selector, live counter refresh scoped to active replay

- Duration dropdown: 30s / 1min / 2min / 5min / 10min / Continuous
- Replay stops automatically when duration elapses
- Live counter refresh (2s rerun) only fires inside running state block
- UI no longer sluggish when replay is not active

Author: marjatmm-sec

src/ui/app.py

@@ -2781,6 +2781,12 @@ def _write_hash_to_env(hash_value: str) -> None:
         if st.button("⏹ Stop Replay", key="stop_replay"):
             stop_replay()
             st.rerun()
+
+        # Live counter refresh — only fires while replay is running,
+        # stops automatically when replay ends (duration elapsed or stopped)
+        import time as _rep_time
+        _rep_time.sleep(2)
+        st.rerun()
     else:
         _rp_c1, _rp_c2 = st.columns(2)
         with _rp_c1:
@@ -2809,6 +2815,19 @@ def _write_hash_to_env(hash_value: str) -> None:
                 help="Anomaly ratio shifts sinusoidally over time — simulates an attack campaign developing",
             )
 
+        _rep_duration_opts = {
+            "30 seconds": 30, "1 minute": 60, "2 minutes": 120,
+            "5 minutes": 300, "10 minutes": 600, "Continuous": None,
+        }
+        _rep_duration_label = st.selectbox(
+            "Duration",
+            list(_rep_duration_opts.keys()),
+            index=1,
+            key="rep_duration",
+            help="Replay stops automatically after this time. Counters refresh live while running.",
+        )
+        _rep_duration_secs = _rep_duration_opts[_rep_duration_label]
+
         if st.button("▶ Start Replay", type="primary", key="start_replay"):
             try:
                 platforms = (["linux","windows","network"]
@@ -2820,6 +2839,7 @@ def _write_hash_to_env(hash_value: str) -> None:
                     rate          = _rep_rate,
                     anomaly_ratio = _rep_ratio,
                     campaign_mode = _rep_campaign,
+                    duration      = _rep_duration_secs,
                 )
                 st.success("🎭 Replay generator started.")
                 st.rerun()
@@ -2852,3 +2872,5 @@ def _write_hash_to_env(hash_value: str) -> None:
     """)
     st.caption(f"CUDA-Q: {'available' if CUDAQ_AVAILABLE else 'not available (CPU mode)'} · "
                f"LLM: {OLLAMA_MODEL} · DB: {DB_PATH}")
+
+