fix(select): keep the active option when options are appended

[lskramarov]

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[NikGurev]

Ошибка все равно воспроизводится: https://koobiq-next--prs-1847-hsycrq0f.web.app/ru/components/select/examples#%D0%BF%D0%BE%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%87%D0%BD%D0%B0%D1%8F-%D0%B7%D0%B0%D0%B3%D1%80%D1%83%D0%B7%D0%BA%D0%B0

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Pull request overview

This PR updates KbqSelect to avoid resetting the user’s current active (highlighted) option when new options are appended while the panel is open (e.g., infinite paging), and updates docs examples + tests to cover asynchronous option loading with preselected values.

Changes:

• Adjust select’s key-manager activation logic to keep the active item stable during option list appends while open, and to avoid search-triggered highlight changes while the panel is still closed.
• Update select paging/loading docs examples to use object values with compareWith, showPreselectedValues, and virtualOptionFactory (via KbqVirtualOption).
• Add unit tests covering async option paging behavior and the “search emits while panel is closed” regression scenario.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/docs-examples/components/select/select-paging/select-paging-example.ts	Updates paging example to bind option objects and enable virtual preselected rendering for unloaded pages.
packages/docs-examples/components/select/select-paging-error/select-paging-error-example.ts	Same as paging example, but for the error-flow paging scenario.
packages/docs-examples/components/select/select-loading/select-loading-example.ts	Updates loading example to support preselected virtual values and object-valued options.
packages/components/select/select.component.ts	Prevents active option highlight from being reset on appended option chunks while the panel is open; refactors stale-active-item check.
packages/components/select/select.component.spec.ts	Adds test coverage for async paging append behavior and search emissions while the panel is closed.

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