fix(overlays): announce info after opening based on platform (#30025)

Issue number: internal

---------

<!-- Please do not submit updates to dependencies unless it fixes an
issue. -->

<!-- Please try to limit your pull request to one type (bugfix, feature,
etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

PR #29951 would hide
the overlays from screen readers while animating. This allows the
element to navigate to its correct destination for screen readers to
interact with. Otherwise, the focus rings would never appear. However,
this ended up breaking the interaction for iOS.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- Overlays are hidden from screen readers while animating only if the
platform is `android`. Since the original issue only applied to Android
devices.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

<!--
  If this introduces a breaking change:
1. Describe the impact and migration path for existing applications
below.
  2. Update the BREAKING.md file with the breaking change.
3. Add "BREAKING CHANGE: [...]" to the commit description when merging.
See
https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#footer
for more information.
-->


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

Dev build: `8.4.1-dev.11732033492.170e160c`

Test on iOS and Android devices.

Author: thetaPC

core/src/utils/overlays.ts

@@ -32,6 +32,7 @@ import {
   removeEventListener,
 } from './helpers';
 import { printIonWarning } from './logging';
+import { isPlatform } from './platform';
 
 let lastOverlayIndex = 0;
 let lastId = 0;
@@ -973,18 +974,26 @@ export const createTriggerController = () => {
  * If the overlay is being presented, it prevents focus rings from appearing
  * in incorrect positions due to the transition (specifically `transform`
  * styles), ensuring that when aria-hidden is removed, the focus rings are
- * correctly displayed in the final location of the elements.
+ * correctly displayed in the final location of the elements. This only
+ * applies to Android devices.
+ *
+ * If this solution is applied to iOS devices, then it leads to a bug where
+ * the overlays cannot be accessed by screen readers. This is due to
+ * VoiceOver not being able to update the accessibility tree when the
+ * `aria-hidden` is removed.
  *
  * @param overlay - The overlay that is being animated.
  */
 const hideAnimatingOverlayFromScreenReaders = (overlay: HTMLIonOverlayElement) => {
   if (doc === undefined) return;
 
-  /**
-   * Once the animation is complete, this attribute will be removed.
-   * This is done at the end of the `present` method.
-   */
-  overlay.setAttribute('aria-hidden', 'true');
+  if (isPlatform('android')) {
+    /**
+     * Once the animation is complete, this attribute will be removed.
+     * This is done at the end of the `present` method.
+     */
+    overlay.setAttribute('aria-hidden', 'true');
+  }
 };
 
 /**