fix(docs): initial theme (#DS-4666)

[artembelik]

No description provided.

[Copilot]

Pull request overview

This PR adjusts the docs app’s theming behavior, particularly around initial theme selection and OS-based auto-theming, and addresses an Angular change-detection warning.

Changes:

• Updates DocsWelcomeComponent to derive the current theme name more defensively from the ThemeService stream.
• Refactors DocsNavbarComponent to inject ThemeService and ChangeDetectorRef via inject, defer the initial theme application using afterNextRender to avoid NG0100, and harden auto-theme handling with a guard on the theme list.

Reviewed changes

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

File	Description
apps/docs/src/app/components/welcome/welcome.component.ts	Adjusts mapping from the current theme to a string used in the welcome component, adding a null-safe check (though with an incomplete guard; see comment).
apps/docs/src/app/components/navbar/navbar.component.ts	Refactors theme-related initialization to use afterNextRender and injected services, and adds a safety check when mutating the auto theme configuration.

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[github-actions]

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