fix(settings): prevent refresh cycle from reverting unsaved toggle changes

Track a _settingsDirty flag that is set whenever the user interacts with
a settings toggle or number input. updateSettingsUI() skips the sync while
dirty so the 2-second refresh cycle cannot revert in-progress edits.
The flag is cleared after a successful save or reset.

extension/dashboard/pages/settings.js

@@ -4,11 +4,25 @@
  * Depends on: core/utils.js ($), core/state.js (settings, SETTINGS_DEFAULTS), ui/toast.js (showToast)
  */
 
+/**
+ * True while the user has made unsaved changes to settings controls.
+ * Prevents the 2-second refresh cycle from overwriting in-progress edits.
+ */
+let _settingsDirty = false;
+
+/** Mark settings as having unsaved changes. */
+function _markSettingsDirty() { _settingsDirty = true; }
+
+/** Clear the dirty flag (called after a successful save or reset). */
+function _clearSettingsDirty() { _settingsDirty = false; }
+
 /**
  * Sync all settings form controls with the current `settings` object.
  * Called on every refresh cycle to keep the UI in sync with persisted state.
+ * Skipped while the user has unsaved changes to avoid reverting their edits.
  */
 function updateSettingsUI() {
+  if (_settingsDirty) return;
   $('toggleNotify')?.classList.toggle('active', settings.notifyOnDisconnect === true);
   $('toggleNotifyTunnelError')?.classList.toggle('active', settings.notifyOnTunnelError !== false);
   $('toggleTunnelAutoReconnect')?.classList.toggle('active', settings.tunnelAutoReconnect === true);
@@ -49,6 +63,7 @@ function saveSettings() {
       if (chrome.runtime.lastError) { showToast('Settings save failed: ' + chrome.runtime.lastError.message, 'error'); return; }
       if (response && response.ok) {
         if (response.settings) settings = { ...SETTINGS_DEFAULTS, ...response.settings };
+        _clearSettingsDirty();
         // Restart the ping interval so the new interval / enabled state takes effect immediately
         if (typeof window._restartPingInterval === 'function') window._restartPingInterval();
         if (response.requiresRestart) {