Introduce tinted glass mechanic and colored lasers with drag-and-drop palette, plus UI layout and styling. CSS: new game-layout, toolbox, glass-palette, glass-item, cell-glass, laser color classes and many visual tweaks (user-select, drop outline, door/button states). JS: add laserColors, glassOptions, glassPlacements, palette creation, drag/drop/dblclick handlers, block browser drop, saveLaserSegment helper, colored laser tracing (red/blue/yellow/white) including mirror/door/button interactions, button/door grouping and initial mirror angles, and updates to loadGrid to render glass and colorized laser segments. HTML: move map into new main layout and add toolbox palette container. Overall enables placing colored glass to influence laser behavior and updates visuals/interaction accordingly.
Add per-cell laserSegments tracking and use it to render correct laser orientation: introduce laserSegments global, reset it at trace start, populate entries when tracing, and consult it in loadGrid to choose horizontal vs vertical classes. Update UI styling from a dark to a lighter theme (body and main backgrounds, cell/empty/mirror/wall colors and laser gradients), remove some borders/fit-content sizing, and add a "map" class to the map container in the HTML. These changes fix laser orientation rendering and refresh the game's visual theme.
