feat(tab): add new config for show file size on tab

[matteobertoldo]

Describe the solution you'd like
Add a new setting to show the file size directly without going through the action via tab.

Describe alternatives you've considered
Consider adding this new setting as a new configuration group for the tab.

Additional context
Also check for correctable UI errors, such as:

• vertical alignment of icons
• addition of a separator border in the footer of the tab
• footprint space of sandbox name on popup hostname (for new on-demand sandboxes)