[client] Add Wails3 + React desktop UI scaffold

Stage 1 of the client/ui (Fyne) replacement. Adds a new client/ui-wails
module that runs on Linux/macOS/Windows from a single React + Vite +
Tailwind frontend driven by a thin gRPC services layer in Go.

- Single-module integration (no submodule): merge Wails3 into root go.mod
  with build tags !android !ios !freebsd !js so cross-compiles on those
  targets exclude the package automatically.
- Seven gRPC-bound services: Connection, Settings, Networks, Profiles,
  Debug, Update, Peers. Peers bridges Status polling and SubscribeEvents
  to the Wails event bus (netbird:status, netbird:event).
- Tray + window shell mirrors the Fyne menu 1:1 with hide-on-close,
  SIGUSR1 / Windows named-event for external "show window" triggers.
- React pages cover functional parity for Status, Settings (3 tabs),
  Networks (3 tabs), Profiles, Debug, Update, QuickActions, LoginUrl.
- SVG-sourced tray icons (12 source SVGs incl. macOS template variants)
  rasterized to PNG via task common:generate:tray:icons.
- Linux launcher sets WEBKIT_DISABLE_DMABUF_RENDERER=1 in the .desktop
  Exec= line and in task linux:run so the app renders correctly under
  RDP, VirtualBox, KVM, and bare WMs (Fluxbox/dwm) without DRM access.

client/ui-wails/services/update.go

@@ -0,0 +1,55 @@
+//go:build !android && !ios && !freebsd && !js
+
+package services
+
+import (
+	"context"
+
+	"github.com/netbirdio/netbird/client/proto"
+)
+
+// UpdateResult mirrors TriggerUpdateResponse: Success false carries an error
+// message in ErrorMsg.
+type UpdateResult struct {
+	Success  bool   `json:"success"`
+	ErrorMsg string `json:"errorMsg"`
+}
+
+// Update groups the RPCs that drive the enforced-update install flow.
+type Update struct {
+	conn DaemonConn
+}
+
+func NewUpdate(conn DaemonConn) *Update {
+	return &Update{conn: conn}
+}
+
+func (s *Update) Trigger(ctx context.Context) (UpdateResult, error) {
+	cli, err := s.conn.Client()
+	if err != nil {
+		return UpdateResult{}, err
+	}
+	resp, err := cli.TriggerUpdate(ctx, &proto.TriggerUpdateRequest{})
+	if err != nil {
+		return UpdateResult{}, err
+	}
+	return UpdateResult{
+		Success:  resp.GetSuccess(),
+		ErrorMsg: resp.GetErrorMsg(),
+	}, nil
+}
+
+func (s *Update) GetInstallerResult(ctx context.Context) (UpdateResult, error) {
+	cli, err := s.conn.Client()
+	if err != nil {
+		return UpdateResult{}, err
+	}
+	resp, err := cli.GetInstallerResult(ctx, &proto.InstallerResultRequest{})
+	if err != nil {
+		return UpdateResult{}, err
+	}
+	return UpdateResult{
+		Success:  resp.GetSuccess(),
+		ErrorMsg: resp.GetErrorMsg(),
+	}, nil
+}