[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/typography/HelpText.tsx

@@ -0,0 +1,24 @@
+import { type ReactNode } from "react";
+import { cn } from "@/lib/cn";
+
+type Props = {
+    children?: ReactNode;
+    margin?: boolean;
+    className?: string;
+    disabled?: boolean;
+};
+
+export const HelpText = ({ children, margin = true, className, disabled = false }: Props) => (
+    <span
+        className={cn(
+            "block text-[.81rem] font-light tracking-wide transition-all duration-300 dark:text-nb-gray-300",
+            margin && "mb-2",
+            disabled && "pointer-events-none opacity-30",
+            className,
+        )}
+    >
+        {children}
+    </span>
+);
+
+export default HelpText;

client/ui/frontend/src/components/typography/Label.tsx

@@ -0,0 +1,42 @@
+import * as LabelPrimitive from "@radix-ui/react-label";
+import { cva, type VariantProps } from "class-variance-authority";
+import { type ComponentPropsWithoutRef, forwardRef, type Ref } from "react";
+import { cn } from "@/lib/cn";
+
+const labelVariants = cva(
+    "mb-1.5 inline-block flex items-center gap-2 text-sm font-medium leading-none tracking-wider peer-disabled:cursor-not-allowed peer-disabled:opacity-70 dark:text-nb-gray-100",
+);
+
+type LabelProps = ComponentPropsWithoutRef<typeof LabelPrimitive.Root> &
+    VariantProps<typeof labelVariants> & {
+        as?: "label" | "div";
+        disabled?: boolean;
+    };
+
+export const Label = forwardRef<HTMLElement, LabelProps>(function Label(
+    { className, as = "label", disabled = false, children, ...props },
+    ref,
+) {
+    const classes = cn(
+        labelVariants(),
+        className,
+        "select-none transition-all duration-300",
+        disabled && "pointer-events-none opacity-30",
+    );
+
+    if (as === "div") {
+        return (
+            <div ref={ref as Ref<HTMLDivElement>} className={classes}>
+                {children}
+            </div>
+        );
+    }
+
+    return (
+        <LabelPrimitive.Root ref={ref as Ref<HTMLLabelElement>} className={classes} {...props}>
+            {children}
+        </LabelPrimitive.Root>
+    );
+});
+
+export default Label;