feat: Add initial value to uiHelpers function

[miikakokkonen]

📑 Description

Adds a parameter to uiHelpers that is used to create the initial state. This way

<script>
const nav= uiHelpers();
nav.isOpen.isOpen = true
</script>

// nav should start open
<Navbar navStatus={nav.isOpen} breakPoint="md" hamburgerMenu={false}>

turns into

<script>
const nav= uiHelpers(true);
</script>

// nav should start open
<Navbar navStatus={nav.isOpen} breakPoint="md" hamburgerMenu={false}>

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

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Name	Status	Preview	Comments	Updated (UTC)
svelte-5-ui-lib	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 10, 2025 7:19am

[miikakokkonen]

Is there interest in this functionality?
Every now and then I found myself setting UIs open programmatically when creating them so i wanted to contribute this possible shortcut.