feat: Revamp System monitoring UI - Reduce system information requests

[louis-jan]

Problem

App displays system informations in the footer bar, which send a lot of requests during app cycle. Should revamp the UI to have expand / collapse section so users can access from anywhere but still ensure the performance.

Design

Figma link: https://www.figma.com/file/ytn1nRZ17FUmJHTlhmZB9f/Jan-App?type=design&node-id=4427-325119&mode=design&t=LbqHwgt8zLarODK6-4

• Remove system monitor on the left ribbon
• Move system monitor on the footer
• Users can only see CPU, mem, GPU metrics when they expand the footer. Reason: to reduce the number of requests sent during app cycle in Jan Server.

User flow

Users click on system monitor to view the metrics:

System monitor includes running models & activity metrics as below, and users can expand the panel or adjust the size of the panel:

[imtuyethan]

This is also part of the epic #1236

[imtuyethan]

Implemented