[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/modules/settings/SettingsSection.tsx

@@ -0,0 +1,43 @@
+import type { ReactNode } from "react";
+import { cn } from "@/lib/cn";
+
+export const SectionGroup = ({
+    title,
+    children,
+    disabled = false,
+}: {
+    title: string;
+    children: ReactNode;
+    disabled?: boolean;
+}) => (
+    <section
+        aria-label={title}
+        tabIndex={disabled ? -1 : 0}
+        {...(disabled ? { inert: "" } : {})}
+        className={cn(
+            "mb-8 rounded-md px-1 outline-none last:mb-1",
+            "focus-visible:ring-2 focus-visible:ring-white/60 focus-visible:ring-offset-2 focus-visible:ring-offset-nb-gray-940",
+            disabled && "pointer-events-none opacity-30",
+        )}
+    >
+        <h2 className={"mb-4 text-xs font-semibold uppercase tracking-wider text-nb-gray-400"}>
+            {title}
+        </h2>
+        <div className={"flex flex-col gap-5"}>{children}</div>
+    </section>
+);
+
+export const SettingsBottomBar = ({ children }: { children: ReactNode }) => (
+    <>
+        <div className={"h-[3.2rem] shrink-0"} aria-hidden={"true"} />
+        <div className={"absolute bottom-0 left-0 w-full"}>
+            <div
+                className={
+                    "flex w-full justify-end gap-3 border-t border-nb-gray-920 bg-nb-gray-940 px-8 py-5"
+                }
+            >
+                {children}
+            </div>
+        </div>
+    </>
+);