[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/FancyToggleSwitch.tsx

@@ -0,0 +1,102 @@
+import React from "react";
+import { HelpText } from "@/components/typography/HelpText";
+import { Label } from "@/components/typography/Label";
+import { ToggleSwitch } from "@/components/switches/ToggleSwitch";
+import { cn } from "@/lib/cn";
+
+interface Props {
+    value: boolean;
+    onChange: (value: boolean) => void;
+    helpText?: React.ReactNode;
+    label?: React.ReactNode;
+    children?: React.ReactNode;
+    disabled?: boolean;
+    loading?: boolean;
+    dataCy?: string;
+    className?: string;
+    labelClassName?: string;
+    textWrapperClassName?: string;
+}
+
+export default function FancyToggleSwitch({
+    value,
+    onChange,
+    helpText,
+    label,
+    children,
+    disabled = false,
+    loading = false,
+    dataCy,
+    className,
+    labelClassName,
+    textWrapperClassName = "max-w-lg",
+}: Readonly<Props>) {
+    const switchId = React.useId();
+    const descriptionId = React.useId();
+
+    if (loading) {
+        const shimmer =
+            "text-transparent select-none rounded bg-[#25282d] box-decoration-clone animate-pulse";
+        return (
+            <div
+                role={"status"}
+                aria-busy={"true"}
+                aria-live={"polite"}
+                className={cn("inline-block w-full text-left", className)}
+            >
+                <div className={"flex justify-between gap-10"}>
+                    <div className={cn(textWrapperClassName)}>
+                        <Label className={labelClassName}>
+                            <span className={shimmer}>{label}</span>
+                        </Label>
+                        <HelpText margin={false}>
+                            <span className={cn(shimmer, "text-[0.6rem] leading-relaxed")}>
+                                {helpText}
+                            </span>
+                        </HelpText>
+                    </div>
+                    <div className={"mt-2 pr-1"}>
+                        <div
+                            aria-hidden={"true"}
+                            className={"h-[24px] w-[44px] animate-pulse rounded-full bg-[#25282d]"}
+                        />
+                    </div>
+                </div>
+            </div>
+        );
+    }
+
+    return (
+        <div
+            {...(disabled ? { inert: "" } : {})}
+            className={cn(
+                "relative z-[1] cursor-default transition-all duration-300",
+                "inline-block w-full text-left",
+                disabled && "pointer-events-none opacity-30",
+                className,
+            )}
+        >
+            <div className={"flex justify-between gap-10"}>
+                <div className={cn(textWrapperClassName)}>
+                    <Label htmlFor={switchId} className={labelClassName}>
+                        {label}
+                    </Label>
+                    <HelpText margin={false}>
+                        <span id={descriptionId}>{helpText}</span>
+                    </HelpText>
+                </div>
+                <div className={"mt-2 pr-1"}>
+                    <ToggleSwitch
+                        id={switchId}
+                        checked={value}
+                        onCheckedChange={onChange}
+                        disabled={disabled}
+                        dataCy={dataCy}
+                        aria-describedby={helpText ? descriptionId : undefined}
+                    />
+                </div>
+            </div>
+            {children && value ? <div className={"mt-4"}>{children}</div> : null}
+        </div>
+    );
+}