refactor: #3606797 Convert the theme hooks to Drupal 11 OOP

Rajab Natshahrequested to merge
issue/vartheme_bs4-3606797:3606797-oop-hooks into 9.0.x

Closes #3606797.

Convert the 8 .theme hooks to Drupal 11 OOP (src/Hook/VarthemeBs4Hooks.php with #[Hook] + constructor DI; .theme functions become #[LegacyHook] shims). Follow-up to the merged !10 (merged) (the refactor commit did not land in that merge).

AI-Generated: Yes (Used Claude Code).

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Edited by Rajab Natshah

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