Suggested improvements to the layout of Node Management screen

Description

I've noticed a few ways to improve the layout of the Node Management screen.

The gaps between the following related elements are too large:

1. "Upload" and the upload bandwidth window;
2. "Download" and the download bandwidth window;
3. "Peers" and the number of peers.

"latest block (auto updates)" and "0" should be put on the same line to be consistent with other parameters mentioned above.

"latest block (auto updates)" should be capitalized.

"Use this tool to call JSONRPC methods" should be a header, not a text inside a window.

There should be a bigger vertical gap between "0" and "Use this tool to call JSONRPC methods".

The "Type json-rpc message" window should have the same width as prior windows.

There should be a gap between the "Type json-rpc message" window and the border of the outer window.