refactor: replace rich text spans with StyledText

[kevmo314]

Replaces Text.rich widgets with StyledText widgets in raid_event.dart and raiding_event.dart files to improve text formatting consistency.

• Text Formatting: Implements StyledText for dynamic text formatting in raid_event.dart and raiding_event.dart, replacing the previous Text.rich implementations. This change aligns with the use of StyledText in other parts of the application for consistent text styling.
• Tag-based Styling: Utilizes tags within StyledText to apply text styles, making the code more readable and maintainable. This approach simplifies the styling process by using predefined tags instead of manual TextSpan configurations.
• Maintains Visual Output: Ensures that the visual output remains unchanged by matching the StyledText styling with the previous TextSpan styling, thus preserving the user interface's look and feel.

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