esim: tune CFUN wait to 2s, fix refresh/switch race in CellularManager

- Reduce post-CFUN sleep from 3s to 2s (modem reliably ready)
- Add _finish_refresh that skips UI update when busy, preventing
  stale profile list from flashing during switch operations

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: greatgitsby

system/hardware/tici/lpa.py

@@ -771,4 +771,5 @@ def switch_profile(self, iccid: str) -> None:
         raise LPAError(f"EnableProfile failed: {PROFILE_ERROR_CODES.get(code, 'unknown')} (0x{code:02X})")
       if code == 0x00:
         self._client._serial.write(b'AT+CFUN=0\rAT+CFUN=1\r')
+        time.sleep(2)
         self._client._serial.reset_input_buffer()

system/ui/lib/cellular_manager.py

@@ -122,14 +122,21 @@ def worker():
           lpa = self._ensure_lpa()
           lpa.process_notifications()
           profiles = lpa.list_profiles()
-        self._callback_queue.append(lambda: self._finish(profiles=profiles))
+        self._callback_queue.append(lambda: self._finish_refresh(profiles))
       except Exception:
         cloudlog.exception("Failed to list eSIM profiles")
         time.sleep(LPA_RETRY_INTERVAL)
         self._callback_queue.append(lambda: self.refresh_profiles())
 
     threading.Thread(target=worker, daemon=True).start()
 
+  def _finish_refresh(self, profiles: list[Profile]):
+    if self._busy:
+      return
+    self._profiles = profiles
+    for cb in self._profiles_updated_cbs:
+      cb(profiles)
+
   def switch_profile(self, iccid: str):
     self._switching_iccid = iccid
     self._run_operation(lambda lpa: lpa.switch_profile(iccid), "Failed to switch eSIM profile")