Improve visual spell effects

[Hartwich]

Goal

Make Magic Duell spells clearer on the host screen.

Codex Auftrag

Improve Magic Duell visual spell effects on the host screen.

Focus

• clearer cast animation
• clearer impact animation
• distinct effect types for different skills if possible
• avoid overloading the screen with too many particles

Acceptance Criteria

• Existing spell logic is unchanged unless necessary.
• Each changed effect remains readable on a TV screen.
• Effects do not hide important player information.
• npm run typecheck passes.
• npm run build passes.

Safety

Do not add copyrighted, unclear, or unreviewed third-party assets or content.