Added snap installation support

[BoskyWSMFN]

The PR improves compatibility of the extension by allowing it to detect and use the correct tailscaled.sock socket path automatically, depending on how Tailscale is installed:

• Native installation (apt/dnf):
  /var/run/tailscale/tailscaled.sock
• Snap installation:
  /var/snap/tailscale/common/socket/tailscaled.sock

The TailscaleApiClient constructor now:

• Checks if the native socket path exists.
• Falls back to the snap path if needed.
• Throws an error if neither socket is found.

[abn]

Might be a good idea to use a list of values and iterate over them instead of hard coding cases. This way we can simply add "well known" paths later for anything else.

Alternatively (likely a separate PR) would even be great to be able to move this to a configuration setting that users can set.

[BoskyWSMFN]

Well, the idea with a list might be good for custom tailscale builds, yes, but this PR is just a quick fix for my specific case.