Fix parent typing to use ShallowRef

[vBenTec]

This PR adjusts the typing of the parent property in VueDragAndDropData.
Previously, it was defined as:

HTMLElement | Ref<HTMLElement | undefined>

However, in practice we are passing a template ref, which in Vue 3 is typed as a ShallowRef.

Problem

When consuming this interface, TypeScript raises errors because the type does not align with how Vue template refs are defined:

Vue: Type 'ShallowRef<T | null>' is not assignable to type 
'HTMLElement | Ref<HTMLElement | undefined>'
  Type 'ShallowRef<T | null>' is not assignable to type 
  'Ref<HTMLElement | undefined>'

Currently, the workaround is to cast ShallowRef to Ref, but this is misleading and hides the actual usage pattern.

Solution

Update the type definition to reflect Vue’s behavior:

parent: HTMLElement | ShallowRef<HTMLElement | undefined>;

This makes the typing consistent with useTemplateRef and avoids unnecessary type assertions.

Impact

• Fixes TypeScript mismatches when passing template refs.
• No runtime changes — this is purely a type-level correction.

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[vBenTec]

Duplicate of #147 (comment)