fix(dropdown): correct offsetY for explicit yPosition='above' (#DS-5168)

[NikGurev]

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[Copilot]

Pull request overview

Fixes dropdown vertical offset behavior when yPosition="above" is explicitly set, ensuring the overlay gap is applied in the correct direction and adding regression tests to cover the corrected positioning.

Changes:

• Adjusted KbqDropdownTrigger position strategy to resolve offsetY sign based on the effective overlayY connection point.
• Added unit tests verifying (1) explicit yPosition="above" opens above when space allows, and (2) the generated CDK positions carry the expected offsetY direction for both above and below.

Reviewed changes

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

File	Description
packages/components/dropdown/dropdown-trigger.directive.ts	Fixes vertical offset sign resolution so explicit yPosition="above" applies a negative offsetY for the “panel above” positions.
packages/components/dropdown/dropdown.spec.ts	Adds regression coverage for explicit above positioning and verifies offsetY direction passed into withPositions.

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