Announce sweeper: refresh open records from content

A date or place corrected after first announce never reached the
portal_events record, so the followup fired on the stale schedule.
While a record is still in its initial state, content is the source
of truth: differing responses are written back on each sweep.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y42TyF8Zu7NGRR2893vNcZ

src/announce.rs

@@ -92,6 +92,18 @@ pub async fn sweep(state: &AppState) -> anyhow::Result<()> {
             Some(a) => a,
         };
 
+        // Content is the source of truth while the window is still
+        // open: a corrected date or place flows into the record, so the
+        // followup fires on the schedule the page actually announces.
+        if answer.state == schema.initial && answer.responses != responses {
+            let mut refreshed = answer.clone();
+            refreshed.responses = responses.clone();
+            if let Some(store) = &store {
+                store.put(&id, serde_json::to_vec(&refreshed)?.into()).await?;
+                tracing::info!(question = %q.id, "event record refreshed from content");
+            }
+        }
+
         if answer.state == schema.initial && now_ms >= ends {
             let target = "awaiting_summary";
             let payload = serde_json::json!({ "to": target, "item": id, "by": "portal" });