fix: Add proxy options to Settings UI

[1208nn]

This pull request makes a small improvement to the SettingsUI by ensuring that the proxy options are dynamically added to the proxy option dropdown list when the UI is initialized.

• UI Enhancement:
  • In scripts/SettingsUI.gd, the _ready() function now adds all available proxy options from _proxy_options to the ProxyOptionList UI element, ensuring the dropdown is populated correctly.

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[Copilot]

Pull request overview

Improves the Settings UI initialization by ensuring the proxy OptionButton is populated at runtime so the saved proxy setting can be selected correctly.

Changes:

• Populate ProxyOptionList from _proxy_options during _ready().
• Select the persisted proxy option index after populating the dropdown.

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[Copilot]

ProxyOptionList is being populated with the raw internal values (off/on/download), which will show those identifiers in the UI instead of the localized/user-friendly strings already present in text/*/settings_tab.csv (e.g. obtn_proxy_option_off/on/download). Consider clearing the OptionButton first and adding translated display labels (while keeping the mapping to _proxy_options for persistence).

Suggested change

	for option in _proxy_options:
	%ProxyOptionList.add_item(option)
	%ProxyOptionList.clear()
	for option in _proxy_options:
	var label := tr("obtn_proxy_option_" + option)
	%ProxyOptionList.add_item(label)