🍞 Connection error toasts

[tcatlas]

📋 Description

Adds translatable user-friendly error message toasts for the following cases:

• "Aborted (see logs)" → "Remote host unreachable"
• "Connection not available" → "Remote host unreachable"
• "Connection refused" → "Connection refused by remote host"
• "Authentication" errors → "Authentication failed"
• "Timeout" errors → "Connection timed out"
• "Permission denied" → "Permission denied"

Tested against SSH, RDP, VNC.

🚀 Changes made to ...

• 🔧 Server
• 🖥️ Client
• 📚 Documentation
• 🔄 Other: ___

✅ Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have looked for similar pull requests in the repository and found none
• This pull request does not contain translations (translations are managed through Crowdin)

🔗 Related Issues

Fixes #1031

[yangjieshao]

使用 toasts 有两个问题
There are two issues with using toasts

1. 可能会错过这个错误信息
   This error message might be missed
   比如我点击发起连接了，然后在等待链接的时候离开座位去拿水喝，等回到座位会会错过错误信息。
   For example, if I click to initiate a connection and then leave my seat to get water while waiting for the link, I may miss an error message when I return to my seat.

2. 如果同时向多个服务器发起连接，会不清楚错误信息是哪个服务器的
   If connections are initiated to multiple servers simultaneously, it may be unclear which server's error message corresponds to which

我认为一个比较合适的显示方式是不要关闭tab标签，直接把错误信息显示在原来渲染远程画面的地方
I think a more suitable display method is not to close the tab tab, but to directly display the error message in the original location where the remote screen was rendered

[MeJIuFaRo]

I also request that you add logs for successful SSH connections.