Mountain Update: Mica mechanics, 5% luminosity, and smelting into Marble

To enhance the underground of the new high mountain ranges, Mica (Csillámpala) should be added as a unique layered stone layer with the following core mechanics:Mining & Crushed Mica: When a player mines a Mica block with any pickaxe, it drops Crushed Mica (zúzott csillámpala) instead of the block itself, keeping it consistent with Vanilla mining logic.Luminosity: Natural Mica blocks generated in the caves should have a subtle 5% luminosity. This allows them to faintly shimmer in the dark, guiding players through the deep mountain caves.Smelting into Marble: By smelting Crushed Mica in a furnace, players can craft Marble (Márvány). This would introduce a highly requested, beautiful white building block to the game, which can be further crafted into stairs, slabs, and polished variants.