wired PICK SKY server-side polarity countdown via threading.Timer (tasks.py); fixed polarity_done overlay gating on refresh; cleared sig-select floats on overlay dismiss; filtered Redact events from Most Recent applet

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/apps/billboard/views.py

@@ -27,7 +27,13 @@ def billboard(request):
         .first()
     )
     recent_events = (
-        list(recent_room.events.select_related("actor").order_by("-timestamp")[:36])[::-1]
+        list(
+            recent_room.events
+            .select_related("actor")
+            .exclude(verb=GameEvent.SIG_UNREADY)
+            .exclude(verb=GameEvent.SIG_READY, data__retracted=True)
+            .order_by("-timestamp")[:36]
+        )[::-1]
         if recent_room else []
     )