Rename CoderVPN to Coder (Connect) in UI

[matifali]

Let's use "Coder" as a standalone term (e.g., in the VPN & Filters panel). For other user-facing messages, i.e., error or information messages, use Coder Connect.

• macOS
  

  
  

  screenshot

  
  
  

• Windows

[matifali]

Reopening as we still need to do for Windows