[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/ui/icons_menu_linux.go

@@ -0,0 +1,22 @@
+//go:build linux
+
+package main
+
+import _ "embed"
+
+// 24x24: GTK4 menu rows render 22–48 px with no downscaling.
+
+//go:embed assets/netbird-menu-dot-connected.png
+var iconMenuDotConnected []byte
+
+//go:embed assets/netbird-menu-dot-connecting.png
+var iconMenuDotConnecting []byte
+
+//go:embed assets/netbird-menu-dot-error.png
+var iconMenuDotError []byte
+
+//go:embed assets/netbird-menu-dot-idle.png
+var iconMenuDotIdle []byte
+
+//go:embed assets/netbird-menu-dot-offline.png
+var iconMenuDotOffline []byte