fix(SelectNext): reset search-input on dropdown close (DS-5217)

[KamilEmeleev]

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[Copilot]

Pull request overview

This PR fixes SelectNext search behavior by clearing the internal search query when the dropdown closes (while preserving controlled inputValue behavior), aligning the component’s UX with DS-5217.

Changes:

• Add internal controlled state for the search query and reset it on open→close transitions for uncontrolled usage.
• Wire SelectList search input changes through the new internal state setter to ensure onInputChange is called consistently.
• Add/extend Vitest coverage to validate reset behavior, default input handling, and controlled input preservation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/components/src/components/SelectNext/Select.tsx	Introduces controlled search input state + effect to reset query when the dropdown closes (uncontrolled only).
packages/components/src/components/SelectNext/tests/Select.test.tsx	Adds regression tests covering query reset on close, defaultInputValue behavior, and controlled inputValue not being reset.

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