fix(design-system): Add explicit type annotation for slots in DateRangePicker component

[everettbu]

Mirror of n8n-io/n8n#21188
Original author: samir0607

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Summary

This PR fixes a TypeScript compiler complaint (TS7022) in the DateRangePicker component by adding an explicit type annotation for the slots variable.

What I changed:

In DateRangePicker.vue
Imported type Slots from vue.
Annotated slots as const slots: Slots = useSlots();.

Solves:
Status: Open.
#21187

Why:

TypeScript raised TS7022: "'slots' implicitly has type 'any' because it does not have a type annotation and is referenced directly or indirectly in its own initializer."
Adding the explicit Slots type restores proper typing for slots, improves IDE autocompletion, and prevents strict type-checking failures (for example under noImplicitAny).

Notes:

This change is low-risk and purely improves typing; no functional behavior was modified.
Unit tests for DateRangePicker are present and should continue passing.

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

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Note

Add explicit Vue Slots type for slots in DateRangePicker.vue to resolve typing error.

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