Retain live processing timings across UI reruns

tests/test_streamlit_app.py

@@ -1,6 +1,7 @@
 from datetime import date
 
 from mka.application.meeting_service import ParticipantInput
+from mka.application.progress_timing import TimingSnapshot
 from mka.application.run_inputs import RunInputState
 from mka.ui import streamlit_app
 
@@ -66,3 +67,29 @@ def test_imported_inputs_are_applied_via_pending_state_before_widgets(
     assert "source_media_1" not in state
     assert "pending_run_inputs" not in state
     assert state["source_media_0"] is existing_upload
+
+
+def test_duration_formatting_covers_seconds_minutes_and_hours() -> None:
+    assert streamlit_app._format_duration(8.9) == "00:08"
+    assert streamlit_app._format_duration(7 * 60 + 18) == "07:18"
+    assert streamlit_app._format_duration(3600 + 3 * 60 + 42) == "1:03:42"
+
+
+def test_completed_regeneration_timing_survives_frontend_rerun(monkeypatch) -> None:
+    state = {}
+    monkeypatch.setattr(streamlit_app.st, "session_state", state)
+    timing = TimingSnapshot(
+        stage_durations={"protocol_generation": 4.5},
+        active_stage=None,
+        total_duration=4.5,
+        running=False,
+    )
+    states = {stage: "skipped" for stage in streamlit_app.STAGES}
+    states["protocol_generation"] = "completed"
+
+    streamlit_app._remember_regeneration_timing(states, "Protocol regenerated", timing)
+
+    saved_states, saved_message, saved_timing = state["regeneration_progress"]
+    assert saved_states["protocol_generation"] == "completed"
+    assert saved_message == "Protocol regenerated"
+    assert saved_timing == timing