chore(textarea): added examples, improved documentation (#DS-4311)

[artembelik]

No description provided.

[Copilot]

Pull request overview

This PR adds comprehensive documentation and example components for the textarea component, replacing the old single example with five focused examples demonstrating different features and states.

• Replaced the old TextAreaOverviewExample with multiple focused examples following improved naming conventions
• Added documentation in both English and Russian explaining textarea features with code examples
• Updated the dev environment to showcase all new examples with proper theming support

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
packages/docs-examples/components/textarea/textarea-overview/textarea-overview-example.ts	Basic textarea example showing minimal configuration
packages/docs-examples/components/textarea/textarea-max-rows/textarea-max-rows-example.ts	Example demonstrating maxRows attribute limiting textarea height
packages/docs-examples/components/textarea/textarea-error-state/textarea-error-state-example.ts	Example showing validation and error state handling
packages/docs-examples/components/textarea/textarea-disabled/textarea-disabled-example.ts	Example demonstrating disabled state with toggle control
packages/docs-examples/components/textarea/textarea-can-grow/textarea-can-grow-example.ts	Example showing auto-resize functionality with canGrow attribute
packages/docs-examples/components/textarea/text-area-overview/text-area-overview-example.ts	Removed old example file with inconsistent naming
packages/docs-examples/components/textarea/index.ts	Updated exports and module to include all new examples with corrected naming
packages/components/textarea/textarea.ru.md	Added Russian documentation with sections for each feature
packages/components/textarea/textarea.en.md	Added English documentation replacing "in progress" placeholder
packages/components-dev/textarea/template.html	Added theme toggle and visual separators for dev environment
packages/components-dev/textarea/styles.scss	Added styling for consistent dev app layout
packages/components-dev/textarea/module.ts	Updated to import and display all new examples
packages/components-dev/ssr/module.ts	Updated SSR module to use corrected example naming

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