Fix internet-connection: status never resets to disconnected

[CoderFX]

Summary

• Fix status permanently stuck on 'C' after first connection — added on_ui_update with timeout-based disconnect detection (default 120s)
• Fix float position from ui.width() / 2 — use integer division
• Add configurable position and timeout via options
• Add __init__, on_config_changed, on_loaded with .get() defaults
• Remove unused subprocess import
• Remove __name__ class attribute that shadows Python builtin

Config

[main.plugins.internet-connection]
enabled = true
position = "150, 0"
timeout = 120