Use virtualization on mobile devices

[yinanazhou]

On mobile devices, setting pagination to 50/100 items per page causes performance issues due to:

• Rendering all DOM nodes at once
• Loading all images simultaneously (high bandwidth/memory usage)
• Poor scroll performance

Consider using virtualization for the instrument list page to render only visible items + buffer.

Affected pages:

• Instrument list
• Instrument detail: Language table (lower priority, text only, may not worth it)