feat: add dynamic pet size configuration slider and adaptive interaction radius

[mx57]

Добавлена возможность кастомизации размера питомца через слайдер в окне настроек (50-250px), поддержка динамического изменения размера окна PetWindow и автомасштабирование радиуса поглаживания в InputManager.

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PR created automatically by Jules for task 16937857471234137810 started by @mx57

[google-labs-jules]

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