feat(v2)/accordion

[phongit-kha]

Why did you create this PR

• This PR was created to add the new Accordion component.

What did you do

• Feated Accordion components (Root, Item, Trigger, Content) for collapsible sections.
• Added Storybook examples for the Accordion.
• Updated +page.svelte to include an Accordion example.
• Updated pnpm-lock.yaml with the new bits-ui version.

[changeset-bot]

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Latest commit: 248d8de

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[leomotors]

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