Draft: chore: add a new utility class `CategoryStringFormatter` to handle category string formatting

Description

This commit ensures consistent capitalization of categories throughout the application (inside category list and app details screens).

Screenshots

Technical details

A CategoryStringFormatter utility class has been added to capitalize categories such as "health and fitness" to "Health and Fitness" etc.

Tests

Unit tests are added to check the formatting. Manual tests are also performed.

Issues

e/backlog#6456

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Summary by CodeRabbit

• New Features

  • Introduced a utility for formatting category strings, improving readability and presentation.
  • Added new constants for game categories to streamline category title management.

• Enhancements

  • Updated category title formatting logic for better consistency and branding alignment.
  • Refactored logic for updating category titles, improving code clarity and maintainability.

• Bug Fixes

  • Corrected capitalization of category titles for consistency.

• Documentation

  • Updated copyright information in relevant files.