Brings two main-side PRs' UI behavior across the Fyne→Wails rewrite:
- #5631 (IPv6 overlay support): add "Enable IPv6" row to the polished
SettingsNetwork tab; the legacy screens/Settings.tsx already had it,
but modules/settings/SettingsNetwork.tsx (the user-visible Settings
window) was missing the toggle.
- #6150 (mirror v4 exit selection onto v6 pair): replace the literal
"0.0.0.0/0" || "::/0" filter in screens/Networks.tsx with an
isDefaultRoute() helper that handles the daemon's merged-range
display string (e.g. "0.0.0.0/0, ::/0"), so paired v4/v6 exit
nodes are classified correctly.
