fix(accordion): update design and tokens (#30606)

Issue number: internal
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## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->
- update tokens;
- fix item content padding;

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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  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.
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## Other information

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

[basic](https://ionic-framework-git-rou-12135-ionic1.vercel.app/src/components/accordion/test/basic?ionic:theme=ionic)

[states](https://ionic-framework-git-rou-12135-ionic1.vercel.app/src/components/accordion/test/states?ionic:theme=ionic)
[Group
States](https://ionic-framework-git-rou-12135-ionic1.vercel.app/src/components/accordion-group/test/states?ionic:theme=ionic)

---------

Co-authored-by: ionitron <[email protected]>

Author: JoaoFerreira-FrontEnd

core/src/components/accordion-group/accordion-group.ionic.scss

@@ -19,19 +19,19 @@
 }
 
 :host(.accordion-group-expand-inset.accordion-group-shape-round) {
-  --border-radius: #{globals.$ion-border-radius-400};
+  --border-radius: #{globals.$ion-round-xl};
 
-  @include globals.border-radius(globals.$ion-border-radius-400);
+  @include globals.border-radius(globals.$ion-round-xl);
 }
 
 :host(.accordion-group-expand-inset.accordion-group-shape-soft) {
-  --border-radius: #{globals.$ion-border-radius-200};
+  --border-radius: #{globals.$ion-soft-xl};
 
-  @include globals.border-radius(globals.$ion-border-radius-200);
+  @include globals.border-radius(globals.$ion-soft-xl);
 }
 
 :host(.accordion-group-expand-inset.accordion-group-shape-rectangular) {
-  --border-radius: #{globals.$ion-border-radius-0};
+  --border-radius: #{globals.$ion-rectangular-xl};
 
-  @include globals.border-radius(globals.$ion-border-radius-0);
+  @include globals.border-radius(globals.$ion-rectangular-xl);
 }