Introduce a new rotator button tile and mirror auto-rotation feature. CSS adds styles for rotator buttons and locked mirror display. JS: add legend entry and rotatorButtons config, track activeRotatorButtons and rotatorIntervals, implement rotateMirrorStep, isMirrorControlledByButton, syncRotatorButtons and stopAllRotatorButtons; wire rotator behavior into traceLaser and loadGrid so rotator buttons activate intervals that rotate target mirrors automatically and lock out manual rotation. Refactor rotateMirror to reuse rotation step logic and ensure rotator intervals are cleared when advancing levels.
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.
