[client] UI refactor (#6069)

Refactor UI

---------

Co-authored-by: Eduard Gert <kontakt@eduardgert.de>
Co-authored-by: braginini <bangvalo@gmail.com>
Co-authored-by: Pascal Fischer <32096965+pascal-fischer@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: riccardom <riccardomanfrin@gmail.com>

client/internal/engine_lazyconn.go

@@ -0,0 +1,19 @@
+package internal
+
+import (
+	"errors"
+)
+
+// SetLazyConnEnabled applies a local lazy connection override to the running
+// engine. It pins the setting like an env/CLI flag, so a later management sync
+// cannot override it. syncMsgMux guards ConnMgr, which is not thread-safe.
+func (e *Engine) SetLazyConnEnabled(enabled bool) error {
+	e.syncMsgMux.Lock()
+	defer e.syncMsgMux.Unlock()
+
+	if e.connMgr == nil {
+		return errors.New("connection manager is not initialised")
+	}
+
+	return e.connMgr.SetLocalLazyConn(e.ctx, enabled)
+}