Improve host camera zoom behavior

[Hartwich]

Goal

Improve Arena Survivor host camera zoom behavior.

Codex Auftrag

Make camera behavior more stable during gameplay.

Focus

• keep all active players visible when possible
• avoid zooming too far out
• avoid hiding important enemies/projectiles
• smooth camera movement if applicable

Acceptance Criteria

• Camera behavior is more stable during normal gameplay.
• Players remain readable.
• Enemies and important effects remain visible.
• npm run typecheck passes.
• npm run build passes.

Safety

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