[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/error/ErrorDialog.tsx

@@ -0,0 +1,64 @@
+import { useCallback, useEffect } from "react";
+import { useTranslation } from "react-i18next";
+import { useSearchParams } from "react-router-dom";
+import { AlertCircleIcon } from "lucide-react";
+import { Button } from "@/components/buttons/Button";
+import { ConfirmDialog } from "@/components/dialog/ConfirmDialog";
+import { DialogActions } from "@/components/dialog/DialogActions";
+import { DialogDescription } from "@/components/dialog/DialogDescription";
+import { DialogHeading } from "@/components/dialog/DialogHeading";
+import { SquareIcon } from "@/components/SquareIcon";
+import { WindowManager } from "@bindings/services";
+import { useAutoSizeWindow } from "@/hooks/useAutoSizeWindow";
+
+const WINDOW_WIDTH = 380;
+
+export default function ErrorDialog() {
+    const { t } = useTranslation();
+    const contentRef = useAutoSizeWindow<HTMLDivElement>(WINDOW_WIDTH);
+    const [params] = useSearchParams();
+
+    const title = params.get("title") || t("window.title.error");
+    const message = params.get("message") || "";
+
+    const close = useCallback(() => {
+        WindowManager.CloseError().catch(console.error);
+    }, []);
+
+    useEffect(() => {
+        const onKey = (e: KeyboardEvent) => {
+            if (e.key === "Escape") close();
+        };
+        globalThis.addEventListener("keydown", onKey);
+        return () => globalThis.removeEventListener("keydown", onKey);
+    }, [close]);
+
+    return (
+        <ConfirmDialog ref={contentRef} aria-labelledby={"nb-error-dialog-title"}>
+            <SquareIcon icon={AlertCircleIcon} variant={"danger"} />
+
+            <div className={"flex flex-col items-center gap-1"}>
+                <DialogHeading id={"nb-error-dialog-title"} className={"text-balance"}>
+                    {title}
+                </DialogHeading>
+                {message && (
+                    <DialogDescription className={"text-balance"}>
+                        <span className={"whitespace-pre-wrap break-words"}>{message}</span>
+                    </DialogDescription>
+                )}
+            </div>
+
+            <DialogActions>
+                <Button
+                    autoFocus
+                    variant={"primary"}
+                    size={"md"}
+                    className={"w-full"}
+                    onClick={close}
+                >
+                    {t("common.close")}
+                </Button>
+            </DialogActions>
+        </ConfirmDialog>
+    );
+}