feat: restart feedback & tunnel control

[franklinkim]

Description

Give the menubar tray icon visible feedback on Restart, and let users manually start/stop individual SSH tunnels from the menu.

Type of Change

• 🐛 Bug fix
• ✨ New feature
• 💥 Breaking change
• 📝 Documentation
• ♻️ Refactoring
• 🏃 Performance
• ✅ Tests
• 🔐 Security
• 🔧 Build/CI

Changes

• Restart click now runs asynchronously and holds a disabled/busy tray icon for a minimum 500ms floor, since the underlying Stop+Start cycle typically completes in
  microseconds — too fast to render otherwise.
• Tunnel rows in the menu are now clickable: listening tunnels (◉) can be stopped, stopped tunnels (○) can be started, wired to the existing
  StopTunnel/StartTunnel controller methods.
• Fixed tunnel row address display: the listen port was only shown when the SSH connection was marked ConnConnected, but the SOCKS5 listener binds (and the port
  becomes usable) as soon as the tunnel starts, independent of the lazy SSH dial. Address now shows whenever the tunnel is listening.

Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my own code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.