feat: polling on by default and an effective-state toggle (v3.5.10)

- Background STATUS polling is enabled by default, per the spec's idle
  polling rule (TS 102 221 14.6.2): `_POLL_ENABLED = True`, __main__ runs
  `_poll_enable()` regardless of card presence (--poll-interval 0 still
  disables) and `_do_status_poll` keeps ticking while enabled even without
  a session, so a cardless start resumes as soon as a card appears.
- A new card session clears a POLLING OFF from the previous card in
  `_apply_equipped_card` before re-enabling polling.
- The Phone-tab toggle now shows the *effective* state: OFF in amber
  ("card disabled polling (POLLING OFF)") while the card suspended
  proactive polling, back to ON on the next POLL INTERVAL.  The 5 s
  background poll now passes `card_disabled` through (it was dropped, so
  an autonomously received POLLING OFF never reached the UI).
- Tests: poll_ui updated (button OFF while suspended, warning path),
  test_poll +2 (cardless ticking, module default via a subprocess check).
- Help EN/RU, docs/api.md, AGENTS; version 3.5.10; sw cache simple-v263.

573 frontend / 441 Python green.

pysim_simple_server/__main__.py

@@ -287,8 +287,13 @@ def main():
     pysim_simple_server.server._CARD_CONNECTED = card is not None
     if opts.poll_interval is not None:
         pysim_simple_server.server._set_poll_interval(opts.poll_interval)
-    # Auto-enable polling if card initialized successfully (unless interval is 0)
-    if server.scc and server.card and opts.poll_interval != 0:
+    # Background STATUS polling is on by default: a CAT terminal polls during
+    # idle (TS 102 221 14.6.2).  --poll-interval 0 disables it, and a card
+    # that wants no polling suspends it with POLLING OFF (TS 102 223 6.4.14)
+    # until a new POLL INTERVAL.
+    if opts.poll_interval == 0:
+        pysim_simple_server.server._poll_disable()
+    else:
         pysim_simple_server.server._poll_enable()
     # Start presence monitoring only after the startup init: pyscard reports an
     # already-present card as "added" on the first pass, and we must not