Add style prop to TreeViewItem to allow control of content's width

[HenryRocha]

Describe the feature in detail (code, mocks, or screenshots encouraged)

When using the component TreeViewItem the content does not fill the full width. To allow better control of this component's contents the users should be able to pass a style prop to customize the container's width.

Here's a simple example code:

<script lang="ts">
    import { TreeView, TreeViewItem } from '@skeletonlabs/skeleton';
</script>

<div class="flex flex-row h-screen">
    <div class="w-1/2 p-4 flex flex-col items-center bg-white"></div>
    <div class="w-1/2 p-4">
        <div class="flex flex-row">
            <h1 class="w-full text-center text-5xl">Content</h1>
        </div>

        <TreeView open={true}>
            <TreeViewItem>
                <h1 class="text-3xl">Basic Information</h1>

                <svelte:fragment slot="children">
                    <TreeViewItem>
                        <div class="flex items-center space-x-5">
                            <h1 class="w-1/6 text-xl">Email:</h1>

                            <label class="w-5/6 label">
                                <input class="input" type="text" placeholder="[email protected]" />
                            </label>
                        </div>
                    </TreeViewItem>
                </svelte:fragment>
            </TreeViewItem>
        </TreeView>
    </div>
</div>

Here's a screenshot of the current result:

To make it work we currently need to make use of the regionSummary prop:

<TreeViewItem regionSummary="[&>.tree-item-content]:grow">

What type of pull request would this be?

New Feature

Provide relevant links or additional information.

No response

[salisshuaibu11]

@endigo9740 i would like to work on this

[endigo9740]

Thank you Salisu, but I need to talk this over with @Mahmoud-zino before we act on it. We may hold off on this for v3.

[Mahmoud-zino]

This for sure should be added in v3 (I will note it there), but I think we can easily add it to v2 if we have the capacity 👍