[management,client] 0.75.0 release with new desktop UI (#6473)

- **Wails v3 application** (`client/ui`) with a React + TypeScript + Tailwind frontend replacing the Fyne UI: main connection view, exit-node switcher, networks/peers browser with detail panels, profile management, settings (general, network, SSH, security, troubleshooting, appearance), debug-bundle creation, and a first-run welcome flow.
- **Internationalization**: go-i18n bundle with 9 locales (en, de, es, fr, hu, it, pt, ru, zh-CN) shared between the tray and the frontend.
- **New system tray** implementation with per-platform theme-aware icons, including a native XEmbed host for Linux (`xembed_tray_linux.c`) and a Linux theme watcher.
- **Session handling**: auth session watcher (`client/internal/auth/sessionwatch`), pending login flow, session-expiration dialog and tray notifications, and `netbird login` improvements.
- **Daemon API extensions** (`daemon.proto`): status stream subscription, event stream, networks/exit-node selection endpoints, and richer full status — with probe throttling on the daemon side to protect against UI-driven request storms.
- **UI preferences store** persisted per profile, autostart management via the daemon (single source of truth in HKCU on Windows).
- **Build system**: Taskfile-based builds per platform (macOS, Linux, Windows), Docker cross-compilation images, MSIX/NSIS/nfpm/AppImage packaging, and a new `frontend-ui` CI workflow.

Co-authored-by: Zoltan Papp <zoltan.pmail@gmail.com>
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: riccardom <riccardomanfrin@gmail.com>

shared/management/client/grpc.go

@@ -654,26 +654,14 @@ func (c *GrpcClient) ExtendAuthSession(sysInfo *system.Info, jwtToken string) (*
 		return nil, err
 	}
 
-	var resp *proto.EncryptedMessage
-	operation := func() error {
-		mgmCtx, cancel := context.WithTimeout(context.Background(), ConnectTimeout)
-		defer cancel()
+	mgmCtx, cancel := context.WithTimeout(c.ctx, ConnectTimeout)
+	defer cancel()
 
-		var err error
-		resp, err = c.realClient.ExtendAuthSession(mgmCtx, &proto.EncryptedMessage{
-			WgPubKey: c.key.PublicKey().String(),
-			Body:     reqBody,
-		})
-		if err != nil {
-			if s, ok := gstatus.FromError(err); ok && s.Code() == codes.Canceled {
-				return err
-			}
-			return backoff.Permanent(err)
-		}
-		return nil
-	}
-
-	if err := backoff.Retry(operation, nbgrpc.Backoff(c.ctx)); err != nil {
+	resp, err := c.realClient.ExtendAuthSession(mgmCtx, &proto.EncryptedMessage{
+		WgPubKey: c.key.PublicKey().String(),
+		Body:     reqBody,
+	})
+	if err != nil {
 		log.Errorf("failed to extend auth session on Management Service: %v", err)
 		return nil, err
 	}