fix(toast): swipe gesture works with custom container layout (#29999)

Issue number: resolves #29998

---------

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## What is the current behavior?

Applying a custom layout to `ion-toast::part(container)`, for example
`width: 50%`, will make the part of the toast outside this element's
bounds non-interactive for swiping gestures.


## What is the new behavior?

Can swipe from anywhere on the toast with custom layout applied to
::part(container)

## Does this introduce a breaking change?

- [ ] Yes
- [X] No

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## Other information

| Before | After                                         |
|-------|-----------------------------------------------------|
| <video
src="https://github.com/user-attachments/assets/fc450066-5fb1-4fd9-bfbd-7f2cd55ce855"></video>
| <video
src="https://github.com/user-attachments/assets/991f6a42-f6fe-479b-9f68-7e7e35dca799"></video>
|

core/src/components/toast/toast.scss

@@ -97,6 +97,8 @@
   background: var(--background);
 
   box-shadow: var(--box-shadow);
+
+  pointer-events: auto;
 }
 
 .toast-wrapper.toast-top {
@@ -115,7 +117,6 @@
   display: flex;
 
   align-items: center;
-  pointer-events: auto;
 
   height: inherit;
   min-height: inherit;