Pebble

Gameplay bug fixes from #11. Thanks to @Towboy22 for the report.

Fixed

• Dying mobs can no longer be re-hit, and no longer dupe their drops. A mob's death was reprocessed every tick it kept taking damage during its ~1s death animation, re-rolling its loot (and slime splits / raid bad_omen) each time. Damage is now rejected once an entity enters its death animation, so loot drops exactly once.
• Tree leaves drop saplings, sticks and apples when they decay. Leaf decay was destroying the block without rolling its drop table; it now uses the normal natural-break path, matching what breaking leaves by hand already dropped.

Added

• Sleep overlay. Sleeping in a bed now fades the screen to black with a "Sleeping…" prompt instead of freezing silently; press Sneak or Esc to leave the bed.
• Entity contact shadows. A soft dark disc is projected onto the ground beneath living entities — including your own player in third person — fading out as they leave the ground.
• Offhand item use + shield blocking. Right-click now falls back to the offhand item when the main hand does nothing (food, shields, torches, throwables, …), and raising a shield negates frontal melee, projectile and explosion damage.

All 456 golden tests pass; the entity goldens were re-baselined for the no-dupe death behavior.