Options button icon: mynaCog -> mynaConfigVertical

Manage connections keeps the cog; the global options gear gets the vertical
sliders icon.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ui/src/app/icons.ts

@@ -11,6 +11,7 @@ import {
   mynaChevronDown,
   mynaChevronRight,
   mynaCog,
+  mynaConfigVertical,
   mynaEdit,
   mynaFile,
   mynaFilePlus,
@@ -38,6 +39,7 @@ export const APP_ICONS = {
   mynaChevronDown,
   mynaChevronRight,
   mynaCog,
+  mynaConfigVertical,
   mynaEdit,
   mynaFile,
   mynaFilePlus,