Introduce per-level glass inventory and UI for draggable glass pieces, including disabled state and count labels. glassOptions now hold objects with color, maxAmount and currentAmount; palette creation uses these values to enable/disable dragging, show remaining counts, and update on place/remove. Drag-and-drop logic now tracks a draggedGlassColor fallback, prevents placing when inventory is empty, decrements/increments inventory on place/remove, and rebuilds the palette. Reset inventory on level start and when advancing levels. Also adjust laser tracing: yellow lasers are saved as segments and terminate on target, and yellow interacts with demi-wall corners by saving the segment instead of reflecting (blue still reflects). Add CSS for .glass-item:disabled and .glass-item-label. Overall fixes inventory handling and yellow-laser behavior.
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