ui: auto-refresh the proactive log and STK menu state

The proactive command list only re-rendered on tab/pill switches, so new
fetched commands (background STATUS polling, menu traffic) stayed
invisible while the Phone view was open.

- /api/status now exposes proactive_seq (_PROACTIVE_ENTRY_ID, monotonic
  and not reset with the log), so the existing 2s status poll detects
  changes with no extra request; pysimCardStateUpdate() re-renders the
  log when the sequence changed and the Phone/Phone view is visible
- the 5s backend timer no longer fetches the log (it was discarded) and
  now uses the already-fetched stk-status: when active/pending changes
  while the Phone tab is visible, stkCheckMenu() refreshes the menu
  button without a tab switch
- pysimProactiveLogRender() keeps its scroll position and only shows
  Loading... on a first/empty paint
- tests: proactive seq + STK signature helpers and poll-driven render
  behaviour in card_state.test.js; SW cache v123 -> v124.

pysim_otaman_server/server.py

@@ -1821,6 +1821,7 @@ class PysimHandler(BaseHTTPRequestHandler):
                 'connected': connected,
                 'card_present': bool(getattr(self.server, 'card_present', False)),
                 'card_session': int(getattr(self.server, 'card_session', 0)),
+                'proactive_seq': _PROACTIVE_ENTRY_ID,
                 'equipping': bool(getattr(self.server, 'equipping', False)),
                 'auto_equip': bool(_AUTO_EQUIP),
                 'card': card.name if card else None,