fix(typings): avoid nullable-shorthand-on-inline-object-shape in new CDPBrowser jsdoc

_armActionSettle's return type and _waitForAction's armed param used the
{?{...}} nullable shorthand on an inline object shape, the exact pattern a
sibling commit (0081ef3) just swept the rest of this file for -- also
visibly malformed the generated docs (a trailing "?" on the type, doubled to
"??" on the optional param). Converted both to the union form
({...}|null), matching the rest of the file.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: DavertMik

docs/helpers/CDPBrowser.md

@@ -81,7 +81,7 @@ No timeout here: `_waitForAction` applies the grace window itself, starting from
 runs (after the action's own dispatch already resolved), racing this already-armed listener
 against a fresh timer instead of one that started ticking before the action even began.
 
-Returns **{promise: [Promise][1]<([string][2] | null)>, cancel: [function][3]}?**&#x20;
+Returns **({promise: [Promise][1]<([string][2] | null)>, cancel: [function][3]} | null)**&#x20;
 
 ### _assertLayoutSupported
 
@@ -538,7 +538,7 @@ actually takes: strictly more correct for a slow navigation, not just faster for
 
 #### Parameters
 
-*   `armed` **{promise: [Promise][1]<([string][2] | null)>, cancel: [function][3]}??** from `_armActionSettle`, called before the action.
+*   `armed` **({promise: [Promise][1]<([string][2] | null)>, cancel: [function][3]} | null)?** from `_armActionSettle`, called before the action.
 
 Returns **[Promise][1]<void>**&#x20;
 

lib/helper/CDPBrowser.js

@@ -313,7 +313,7 @@ class CDPBrowser extends Helper {
    * runs (after the action's own dispatch already resolved), racing this already-armed listener
    * against a fresh timer instead of one that started ticking before the action even began.
    *
-   * @returns {?{promise: Promise<string|null>, cancel: function}}
+   * @returns {({promise: Promise<string|null>, cancel: function}|null)}
    * @protected
    */
   _armActionSettle() {
@@ -1515,7 +1515,7 @@ class CDPBrowser extends Helper {
    * actually finish, rather than a fixed sleep that has no relationship to how long the navigation
    * actually takes: strictly more correct for a slow navigation, not just faster for a fast one.
    *
-   * @param {?{promise: Promise<string|null>, cancel: function}} [armed] - from `_armActionSettle`, called before the action.
+   * @param {({promise: Promise<string|null>, cancel: function}|null)} [armed] - from `_armActionSettle`, called before the action.
    * @returns {Promise<void>}
    * @protected
    */