[client] Remove lazy connection UI toggle (#6661)

Lazy connections are now opt-out and controlled centrally by NB_LAZY_CONN,
MDM policy (lazyConnection), and the management feature flag (#6617). The
per-device UI toggle no longer fits this model: after #6617 the daemon stopped
persisting the setting and dropped it from GetConfig, so the Wails toggle always
read back OFF and its writes did not survive a restart.

Remove the toggle and the orphaned runtime plumbing, matching what main did for
the Fyne UI:
- drop the toggle from SettingsNetwork and the lazy i18n keys
- drop LazyConnectionEnabled from the UI settings service and SetConfig request
- drop the runtime-apply block in server.SetConfig
- delete Engine.SetLazyConnEnabled and ConnMgr.SetLocalLazyConn

The proto fields and FullStatus status reporting are left intact.

client/ui/frontend/src/modules/settings/SettingsNetwork.tsx

@@ -12,12 +12,6 @@ export function SettingsNetwork() {
     return (
         <>
             <SectionGroup title={t("settings.network.section.connectivity")}>
-                <FancyToggleSwitch
-                    value={config.lazyConnectionEnabled}
-                    onChange={(v) => setField("lazyConnectionEnabled", v)}
-                    label={t("settings.network.lazy.label")}
-                    helpText={t("settings.network.lazy.help")}
-                />
                 <FancyToggleSwitch
                     value={config.networkMonitor}
                     onChange={(v) => setField("networkMonitor", v)}

client/ui/i18n/locales/de/common.json

@@ -599,12 +599,6 @@
     "settings.network.section.routingDns": {
         "message": "Routing & DNS"
     },
-    "settings.network.lazy.label": {
-        "message": "Lazy-Verbindungen"
-    },
-    "settings.network.lazy.help": {
-        "message": "Statt durchgehend aktive Verbindungen zu halten, aktiviert NetBird sie bei Bedarf anhand von Aktivität oder Signalisierung."
-    },
     "settings.network.monitor.label": {
         "message": "Bei Netzwerkwechsel neu verbinden"
     },

client/ui/i18n/locales/en/common.json

@@ -799,14 +799,6 @@
         "message": "Routing & DNS",
         "description": "Section heading for routing and DNS options. 'DNS' is an acronym — keep it."
     },
-    "settings.network.lazy.label": {
-        "message": "Lazy Connections",
-        "description": "Toggle label: Lazy Connections (on-demand connections)."
-    },
-    "settings.network.lazy.help": {
-        "message": "Instead of maintaining always-on connections, NetBird activates them on-demand based on activity or signaling.",
-        "description": "Helper text for lazy connections."
-    },
     "settings.network.monitor.label": {
         "message": "Reconnect on Network Change",
         "description": "Toggle label: reconnect automatically on network change."

client/ui/i18n/locales/es/common.json

@@ -599,12 +599,6 @@
     "settings.network.section.routingDns": {
         "message": "Enrutamiento y DNS"
     },
-    "settings.network.lazy.label": {
-        "message": "Conexiones bajo demanda"
-    },
-    "settings.network.lazy.help": {
-        "message": "En lugar de mantener conexiones permanentes, NetBird las activa bajo demanda según la actividad o la señalización."
-    },
     "settings.network.monitor.label": {
         "message": "Reconectar al cambiar de red"
     },

client/ui/i18n/locales/fr/common.json

@@ -599,12 +599,6 @@
     "settings.network.section.routingDns": {
         "message": "Routage et DNS"
     },
-    "settings.network.lazy.label": {
-        "message": "Connexions à la demande"
-    },
-    "settings.network.lazy.help": {
-        "message": "Au lieu de maintenir des connexions permanentes, NetBird les active à la demande en fonction de l’activité ou de la signalisation."
-    },
     "settings.network.monitor.label": {
         "message": "Reconnecter en cas de changement de réseau"
     },

client/ui/i18n/locales/hu/common.json

@@ -599,12 +599,6 @@
     "settings.network.section.routingDns": {
         "message": "Útválasztás és DNS"
     },
-    "settings.network.lazy.label": {
-        "message": "Igény szerinti kapcsolatok"
-    },
-    "settings.network.lazy.help": {
-        "message": "Állandó kapcsolatok fenntartása helyett a NetBird igény szerint, aktivitás vagy jelzés alapján aktiválja azokat."
-    },
     "settings.network.monitor.label": {
         "message": "Újracsatlakozás hálózatváltáskor"
     },

client/ui/i18n/locales/it/common.json

@@ -599,12 +599,6 @@
     "settings.network.section.routingDns": {
         "message": "Routing e DNS"
     },
-    "settings.network.lazy.label": {
-        "message": "Connessioni lazy"
-    },
-    "settings.network.lazy.help": {
-        "message": "Invece di mantenere connessioni sempre attive, NetBird le attiva su richiesta in base all'attività o al signaling."
-    },
     "settings.network.monitor.label": {
         "message": "Riconnetti al cambio di rete"
     },

client/ui/i18n/locales/pt/common.json

@@ -599,12 +599,6 @@
     "settings.network.section.routingDns": {
         "message": "Roteamento e DNS"
     },
-    "settings.network.lazy.label": {
-        "message": "Conexões sob demanda"
-    },
-    "settings.network.lazy.help": {
-        "message": "Em vez de manter conexões sempre ativas, o NetBird as ativa sob demanda com base na atividade ou na sinalização."
-    },
     "settings.network.monitor.label": {
         "message": "Reconectar ao mudar de rede"
     },

client/ui/i18n/locales/ru/common.json

@@ -599,12 +599,6 @@
     "settings.network.section.routingDns": {
         "message": "Маршрутизация и DNS"
     },
-    "settings.network.lazy.label": {
-        "message": "Подключения по требованию"
-    },
-    "settings.network.lazy.help": {
-        "message": "Вместо постоянно активных подключений NetBird активирует их по требованию — на основе активности или сигналинга."
-    },
     "settings.network.monitor.label": {
         "message": "Переподключаться при смене сети"
     },

client/ui/i18n/locales/zh-CN/common.json

@@ -599,12 +599,6 @@
     "settings.network.section.routingDns": {
         "message": "路由与 DNS"
     },
-    "settings.network.lazy.label": {
-        "message": "懒连接"
-    },
-    "settings.network.lazy.help": {
-        "message": "NetBird 不会维持始终在线的连接，而是根据活动或信令按需激活连接。"
-    },
     "settings.network.monitor.label": {
         "message": "网络变化时重新连接"
     },

client/ui/services/settings.go

@@ -57,7 +57,6 @@ type Config struct {
 	RosenpassEnabled              bool   `json:"rosenpassEnabled"`
 	RosenpassPermissive           bool   `json:"rosenpassPermissive"`
 	DisableNotifications          bool   `json:"disableNotifications"`
-	LazyConnectionEnabled         bool   `json:"lazyConnectionEnabled"`
 	BlockInbound                  bool   `json:"blockInbound"`
 	NetworkMonitor                bool   `json:"networkMonitor"`
 	DisableClientRoutes           bool   `json:"disableClientRoutes"`
@@ -89,7 +88,6 @@ type SetConfigParams struct {
 	RosenpassEnabled              *bool   `json:"rosenpassEnabled,omitempty"`
 	RosenpassPermissive           *bool   `json:"rosenpassPermissive,omitempty"`
 	DisableNotifications          *bool   `json:"disableNotifications,omitempty"`
-	LazyConnectionEnabled         *bool   `json:"lazyConnectionEnabled,omitempty"`
 	BlockInbound                  *bool   `json:"blockInbound,omitempty"`
 	NetworkMonitor                *bool   `json:"networkMonitor,omitempty"`
 	DisableClientRoutes           *bool   `json:"disableClientRoutes,omitempty"`
@@ -140,7 +138,6 @@ func (s *Settings) GetConfig(ctx context.Context, p ConfigParams) (Config, error
 		RosenpassEnabled:              resp.GetRosenpassEnabled(),
 		RosenpassPermissive:           resp.GetRosenpassPermissive(),
 		DisableNotifications:          resp.GetDisableNotifications(),
-		LazyConnectionEnabled:         resp.GetLazyConnectionEnabled(),
 		BlockInbound:                  resp.GetBlockInbound(),
 		NetworkMonitor:                resp.GetNetworkMonitor(),
 		DisableClientRoutes:           resp.GetDisableClientRoutes(),
@@ -176,7 +173,6 @@ func (s *Settings) SetConfig(ctx context.Context, p SetConfigParams) error {
 		RosenpassEnabled:              p.RosenpassEnabled,
 		RosenpassPermissive:           p.RosenpassPermissive,
 		DisableNotifications:          p.DisableNotifications,
-		LazyConnectionEnabled:         p.LazyConnectionEnabled,
 		BlockInbound:                  p.BlockInbound,
 		NetworkMonitor:                p.NetworkMonitor,
 		DisableClientRoutes:           p.DisableClientRoutes,