[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/contexts/DialogContext.tsx

@@ -0,0 +1,68 @@
+import {
+    createContext,
+    type ReactNode,
+    useCallback,
+    useContext,
+    useMemo,
+    useRef,
+    useState,
+} from "react";
+import { ConfirmModal } from "@/components/dialog/ConfirmModal";
+
+export type ConfirmOptions = {
+    title: ReactNode;
+    description: ReactNode;
+    confirmLabel: string;
+    cancelLabel?: string;
+    danger?: boolean;
+};
+
+type DialogContextValue = {
+    confirm: (options: ConfirmOptions) => Promise<boolean>;
+};
+
+const DialogContext = createContext<DialogContextValue | null>(null);
+
+export function DialogProvider({ children }: Readonly<{ children: ReactNode }>) {
+    const [open, setOpen] = useState(false);
+    const [options, setOptions] = useState<ConfirmOptions | null>(null);
+    const resolverRef = useRef<((result: boolean) => void) | null>(null);
+
+    const confirm = useCallback((opts: ConfirmOptions) => {
+        setOptions(opts);
+        setOpen(true);
+        return new Promise<boolean>((resolve) => {
+            resolverRef.current = resolve;
+        });
+    }, []);
+
+    const settle = (result: boolean) => {
+        resolverRef.current?.(result);
+        resolverRef.current = null;
+        setOpen(false);
+    };
+
+    const value = useMemo<DialogContextValue>(() => ({ confirm }), [confirm]);
+
+    return (
+        <DialogContext.Provider value={value}>
+            {children}
+            <ConfirmModal
+                open={open}
+                title={options?.title ?? ""}
+                description={options?.description ?? ""}
+                confirmLabel={options?.confirmLabel ?? ""}
+                cancelLabel={options?.cancelLabel}
+                danger={options?.danger}
+                onConfirm={() => settle(true)}
+                onCancel={() => settle(false)}
+            />
+        </DialogContext.Provider>
+    );
+}
+
+export const useConfirm = () => {
+    const ctx = useContext(DialogContext);
+    if (!ctx) throw new Error("useConfirm must be used within a DialogProvider");
+    return ctx.confirm;
+};