Made ExoSim properly responsive for mobile devices. I redesigned the mobile header and navigation, reorganized the orbital playback controls, converted the telemetry panel into a two-column layout, and adjusted the simulator, mission controls, and light-curve chart to fit smaller screens without horizontal overflow. I also fixed a light-curve UI issue where switching between “Baseline Stable” and “Transit Detected” caused the chart to move because the labels had different widths. The chart now stays fixed while only the live measurement marker, flux value, and detection status update.