feat(tree): add selectable input to KbqTreeOption (#DS-4276)

[lskramarov]

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Pull request overview

This PR introduces a new selectable input for KbqTreeOption to allow disabling user-driven selection (click/keyboard/select-all) while keeping options focusable/navigable/expandable, and includes related fixes for option action button integration with dropdown/tooltip triggers.

Changes:

• Add selectable input to KbqTreeOption and update tree selection logic to respect it across click, keyboard, range selection, and select-all.
• Fix KbqOptionActionComponent integration by keeping tooltip/dropdown triggers as decorator @ContentChild queries (not signal queries) and restoring dropdownClosed as an EventEmitter.
• Add/extend unit tests and update tree examples/docs to describe the new selectable behavior.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tools/public_api_guard/components/tree.api.md	Updates extracted public API for KbqTreeOption queries and selectable input.
tools/public_api_guard/components/list.api.md	Updates extracted public API for KbqListOption queries after switching trigger queries back to decorator-based.
tools/public_api_guard/components/dropdown.api.md	Updates extracted public API for KbqDropdownTrigger.dropdownClosed type change.
packages/components/tree/tree-selection.component.ts	Enforces selectable across selection paths (click, keyboard auto-select, range selection, select all).
packages/components/tree/tree-selection.component.spec.ts	Adds coverage for non-selectable behavior and regression coverage for action button + dropdown rendering.
packages/components/tree/tree-option.component.ts	Adds selectable input and switches tooltip/dropdown trigger queries to decorator @ContentChild for option-action compatibility.
packages/components/tree/examples.tree.ru.md	Documents selectable behavior in Russian examples.
packages/components/tree/examples.tree.en.md	Documents selectable behavior in English examples.
packages/components/list/list-selection.component.ts	Switches tooltip/dropdown trigger queries to decorator @ContentChild for option-action compatibility.
packages/components/dropdown/dropdown-trigger.directive.ts	Keeps dropdownClosed as @Output() EventEmitter<void> so option-action can subscribe via .pipe().

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