[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_windows.go

@@ -0,0 +1,24 @@
+//go:build windows
+
+package main
+
+import _ "embed"
+
+// SetMenuItemBitmaps sizes the HBITMAP to SM_CXMENUCHECK/SM_CYMENUCHECK (16x16
+// at 100% DPI); larger bitmaps overflow the row, hence this Windows-only set
+// downscaled from the 24x24 originals.
+
+//go:embed assets/netbird-menu-dot-connected-16.png
+var iconMenuDotConnected []byte
+
+//go:embed assets/netbird-menu-dot-connecting-16.png
+var iconMenuDotConnecting []byte
+
+//go:embed assets/netbird-menu-dot-error-16.png
+var iconMenuDotError []byte
+
+//go:embed assets/netbird-menu-dot-idle-16.png
+var iconMenuDotIdle []byte
+
+//go:embed assets/netbird-menu-dot-offline-16.png
+var iconMenuDotOffline []byte