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Added vanilla-accurate shield blocking against TNT Minecart explosions: a player raising a shield while facing the explosion (within a configurable ~90° arc) can now fully negate the damage, matching how shields work against creepers and TNT in vanilla. This is configurable in config.yml (enable/disable, block angle, and how much damage is reduced).

Also fixed a bug where absorption (golden) hearts weren't being depleted by the plugin's damage - only regular health was affected before. Now damage correctly comes out of absorption hearts first, then regular health, as in vanilla.