[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/app.tsx

@@ -0,0 +1,61 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import "./globals.css";
+import { HashRouter, Navigate, Route, Routes } from "react-router-dom";
+import SessionExpirationDialog from "@/modules/session/SessionExpirationDialog.tsx";
+import UpdateInProgressDialog from "@/modules/auto-update/UpdateInProgressDialog.tsx";
+import WelcomeDialog from "@/modules/welcome/WelcomeDialog.tsx";
+import ErrorDialog from "@/modules/error/ErrorDialog.tsx";
+import { AppLayout } from "@/layouts/AppLayout.tsx";
+import { MainPage } from "@/modules/main/MainPage.tsx";
+import { SettingsPage } from "@/modules/settings/SettingsPage.tsx";
+import { SkeletonTheme } from "react-loading-skeleton";
+import "react-loading-skeleton/dist/skeleton.css";
+import { welcome } from "@/lib/welcome";
+import LoginWaitingForBrowserDialog from "@/modules/login/LoginWaitingForBrowserDialog.tsx";
+import { initI18n } from "@/lib/i18n";
+import { initPlatform } from "@/lib/platform";
+import { initLogForwarding } from "@/lib/logs";
+
+// Must run first so even init-time logs reach the Go log pipeline.
+initLogForwarding();
+
+welcome();
+
+Promise.all([
+    initI18n().catch((e) => {
+        console.error("i18n init failed:", e);
+    }),
+    initPlatform().catch((e) => {
+        console.error("platform init failed:", e);
+    }),
+]).finally(() => {
+    ReactDOM.createRoot(document.getElementById("root")!).render(
+        <React.StrictMode>
+            <SkeletonTheme baseColor={"#25282d"} highlightColor={"#33373e"}>
+                <HashRouter>
+                    <Routes>
+                        <Route path={"dialog"}>
+                            <Route
+                                path={"browser-login"}
+                                element={<LoginWaitingForBrowserDialog />}
+                            />
+                            <Route path={"install-progress"} element={<UpdateInProgressDialog />} />
+                            <Route
+                                path={"session-expiration"}
+                                element={<SessionExpirationDialog />}
+                            />
+                            <Route path={"welcome"} element={<WelcomeDialog />} />
+                            <Route path={"error"} element={<ErrorDialog />} />
+                        </Route>
+                        <Route element={<AppLayout />}>
+                            <Route index element={<MainPage />} />
+                            <Route path={"settings"} element={<SettingsPage />} />
+                            <Route path={"*"} element={<Navigate to={"/"} replace />} />
+                        </Route>
+                    </Routes>
+                </HashRouter>
+            </SkeletonTheme>
+        </React.StrictMode>,
+    );
+});