[BUG] Item with checkbox/radio and complex content structure not supported

[x] I have written a good issue

Describe the bug

The following use case with multiple elements in the end slot of item,and a label that is related to the checkbox in the start/default slot of item is no longer supported.

Describe how to reproduce the bug

<kirby-item>
  <data slot="end" class="kirby-text-bold">1234</data>
  <kirby-checkbox slot="end"></kirby-checkbox>
  <kirby-label>
    <h3>Label text for checkbox</h3>
    <p detail>Detail for checkbox</p>
  </kirby-label>
</kirby-item>

Which looks like this:

Which Kirby version was used?

9.7.0

What was the expected behavior?

I expect it to look like this:

Please complete the following information:

OS: [e.g. Windows, MacOS, iOS]
Browser [e.g. Chrome, Safari]
Browser version [e.g. 22]

Are there any additional context?

Checklist:

The following tasks should be carried out in sequence in order to follow the process of contributing correctly.

Verification

To make sure the bug is not intended behaviour; it should be verified by a member of team Kirby before moving on to implementation.

[x] Make sure the NOT verified label has been removed by a member of team Kirby; do not proceed until this is done.

Implementation

The contributor who wants to implement this issue should:

[x] Make sure you have read: "Before you get coding".
[x] Signal to others you are working on the issue by assigning yourself.
[x] Create a branch from the develop branch following our branch naming convention.
[x] Create a test that reproduces the bug following guidelines in: "The good: Test".
[x] Write code to fix the bug

Review

Once the issue has been implemented and is ready for review:

[x] Do a self-review.
[x] Create a pull-request.

kirbydesign / designsystem