feat(DeviceDetailOverlay): update overlay positioning and remove unused media control buttons

src/app/components/DeviceDetailOverlay.tsx

@@ -209,7 +209,7 @@ export default function DeviceDetailOverlay({
           animate={{ y: 0 }}
           exit={{ y: '100%' }}
           transition={{ type: 'spring', damping: 30, stiffness: 300 }}
-          className="absolute inset-0 bg-white overflow-y-auto"
+          className="fixed inset-0 bg-white overflow-y-auto z-50"
           onClick={(e) => e.stopPropagation()}
           onTouchStart={onTouchStart}
           onTouchMove={onTouchMove}
@@ -246,26 +246,6 @@ export default function DeviceDetailOverlay({
                   <RotateCcw className="w-4 h-4" />
                   Reset Device
                 </button>
-                <button
-                  onClick={() => sendCommand('EJECT')}
-                  className="w-full px-4 py-2 text-left hover:bg-neutral-50 flex items-center gap-2"
-                >
-                  <SkipBack className="w-4 h-4" />
-                  Eject Media
-                </button>
-                <button
-                  onClick={() => sendCommand('MOUNT')}
-                  className="w-full px-4 py-2 text-left hover:bg-neutral-50 flex items-center gap-2"
-                >
-                  <Play className="w-4 h-4" />
-                  Mount Media
-                </button>
-                <button
-                  onClick={() => sendCommand('STATUS')}
-                  className="w-full px-4 py-2 text-left hover:bg-neutral-50"
-                >
-                  Get Status
-                </button>
               </div>
             )}