Reorganized the Desktop UI structure

[freakdaniel]

Summary

Reorganized the Desktop UI structure by separating screen-specific styles from shared UI components. The refactoring keeps the existing visual behavior and improves ownership of reusable controls and styles

Type of Change

• Enhancement / improvement
• Refactoring (no functional changes)
• Documentation update

Related Issues

Not applicable

Changes

• Renamed Hyprism.Desktop.Features to Hyprism.Desktop.Screens
• Updated namespaces, XAML paths, tests, and documentation
• Moved shared cross-screen styles to ManagerStyles.axaml
• Kept screen-specific styles next to their respective screens
• Renamed SettingsRow to the reusable FormRow
• Separated control themes from foundation styles
• Removed obsolete FeatureStyles and old screen-specific class names
• Updated English and Russian architecture documentation

Checklist

• Code follows the project's style and conventions
• Self-reviewed the diff before submitting
• No unintended files are included (build artifacts, local configs, etc.)
• Documentation updated if needed