fix(tags): unfocus input on TAB keypress (#DS-5399)

[artembelik]

#1844

[Copilot]

Pull request overview

Adjusts the KbqTagInput keyboard handling so that pressing TAB with an empty input doesn’t get blocked by the tag separator logic, allowing normal focus traversal (blur/unfocus) behavior in forms.

Changes:

• Update KbqTagInput.onKeydown to avoid calling preventDefault() for TAB when the input is empty.
• Add a unit test intended to ensure TAB doesn’t have its default prevented in that scenario.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/components/tags/tag-input.ts	Skips preventDefault() for TAB separator when input is empty to allow focus to move.
packages/components/tags/tag-input.spec.ts	Adds a test for TAB + empty input behavior (currently needs adjustment to be effective).

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