[idd] helper: retry topology after desktop access failure

The interactive Helper can start when the console user token exists but
before WinSta0\Default is ready. SetDisplayConfig then returns
ERROR_ACCESS_DENIED while recovery exit caches the failure and keeps
topology enforcement suppressed.

Keep the recovery request pending while desktop access is transient.
Move the pipe worker to the input desktop and retry without caching
intermediate failures. Leave an exhausted access failure uncached so a
later replay can recover.

Restore the periodic enforcement timer and retry topology without
reapplying a display mode that Windows has already accepted.

idd/LGIddHelper/CNotifyWindow.cpp

@@ -39,6 +39,7 @@
 #define ID_DISPLAY_CHECK_TIMER 1
 #define DISPLAY_SETTLE_DELAY   250
 #define DISPLAY_RETRY_DELAY    1000
+#define DISPLAY_CHECK_INTERVAL 5000
 
 ATOM CNotifyWindow::s_atom = 0;
 UINT CNotifyWindow::s_taskbarCreated = 0;
@@ -135,7 +136,9 @@ LRESULT CNotifyWindow::handleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
 
   case WM_DISPLAYCHANGE:
     if (!m_recoveryActive)
+    {
       scheduleDisplayCheck(DISPLAY_SETTLE_DELAY);
+    }
     return 0;
 
   case WM_TIMER:
@@ -145,10 +148,18 @@ LRESULT CNotifyWindow::handleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam)
       KillTimer(m_hwnd, ID_DISPLAY_CHECK_TIMER);
       if (m_recoveryActive)
         break;
-      if (m_onEnsureOnlyDisplay && m_onEnsureOnlyDisplay())
-        DEBUG_INFO("Enforced Looking Glass as the only display");
+      const bool success =
+        m_onEnsureOnlyDisplay && m_onEnsureOnlyDisplay();
+      if (success)
+      {
+        DEBUG_TRACE("Enforced Looking Glass as the only display");
+      }
       else
+      {
         DEBUG_WARN("Failed to ensure Looking Glass is the only display");
+      }
+      scheduleDisplayCheck(success ?
+        DISPLAY_CHECK_INTERVAL : DISPLAY_RETRY_DELAY);
       break;
     }
     return 0;
@@ -218,7 +229,11 @@ LRESULT CNotifyWindow::onNotifyIcon(UINT uEvent, WORD wIconId, int x, int y)
         PostMessage(m_hwnd, WM_CLEAN_UP_CONFIG, 0, 0);
       });
       if (m_onSettingChange)
-        m_config->onSettingChange(m_onSettingChange);
+        m_config->onSettingChange([this]() {
+          m_onSettingChange();
+          KillTimer(m_hwnd, ID_DISPLAY_CHECK_TIMER);
+          scheduleDisplayCheck(DISPLAY_SETTLE_DELAY);
+        });
       ShowWindow(*m_config, SW_NORMAL);
       break;
     }