[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>

client/ui/frontend/src/components/switches/SwitchItem.tsx

@@ -0,0 +1,42 @@
+import * as RadioGroup from "@radix-ui/react-radio-group";
+import { motion } from "framer-motion";
+import { type ReactNode } from "react";
+import { cn } from "@/lib/cn";
+import { useSwitchItemGroup } from "@/components/switches/SwitchItemGroup";
+
+type Props = {
+    value: string;
+    children: ReactNode;
+    className?: string;
+};
+
+export const SwitchItem = ({ value, children, className }: Props) => {
+    const { value: activeValue, layoutId } = useSwitchItemGroup();
+    const active = activeValue === value;
+
+    return (
+        <RadioGroup.Item
+            value={value}
+            className={cn(
+                "relative inline-flex items-center justify-center gap-1 rounded-md px-3.5 py-2 text-xs font-semibold",
+                "cursor-default outline-none",
+                "focus-visible:ring-2 focus-visible:ring-white/60 focus-visible:ring-offset-2 focus-visible:ring-offset-nb-gray-940",
+                active
+                    ? "text-nb-gray-100"
+                    : "text-nb-gray-400 hover:text-nb-gray-200 active:text-nb-gray-100",
+                className,
+            )}
+        >
+            {active && (
+                <motion.span
+                    layoutId={layoutId}
+                    className={"absolute inset-0 rounded-md bg-nb-gray-700"}
+                    transition={{ type: "spring", stiffness: 500, damping: 35 }}
+                />
+            )}
+            <span className={"relative inline-flex items-center justify-center gap-1"}>
+                {children}
+            </span>
+        </RadioGroup.Item>
+    );
+};