[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/hooks/useFocusVisible.ts

@@ -0,0 +1,49 @@
+import { useEffect, useState } from "react";
+
+// Tracks the user's current input modality (keyboard vs pointer) at module
+// scope, mirroring what @react-aria/interactions does. Radix programmatically
+// focuses elements like Tabs triggers and Select triggers, which makes the
+// browser's :focus-visible heuristic light up on mouse-driven interactions too.
+// Gating focus styles on this hook lets us only paint a focus ring when the
+// user is actually navigating with the keyboard.
+// See react-aria's useFocusVisible for context.
+
+type Modality = "keyboard" | "pointer";
+
+let currentModality: Modality = "pointer";
+const subscribers = new Set<(m: Modality) => void>();
+
+const setModality = (m: Modality) => {
+    if (m === currentModality) return;
+    currentModality = m;
+    subscribers.forEach((cb) => cb(m));
+};
+
+const isKeyboardEvent = (e: KeyboardEvent) => {
+    if (e.metaKey || e.ctrlKey || e.altKey) return false;
+    return e.key === "Tab" || e.key === "Escape" || e.key.startsWith("Arrow");
+};
+
+if (globalThis.window !== undefined) {
+    globalThis.addEventListener(
+        "keydown",
+        (e) => {
+            if (isKeyboardEvent(e)) setModality("keyboard");
+        },
+        true,
+    );
+    globalThis.addEventListener("pointerdown", () => setModality("pointer"), true);
+}
+
+export const useFocusVisible = (): boolean => {
+    const [visible, setVisible] = useState(currentModality === "keyboard");
+    useEffect(() => {
+        setVisible(currentModality === "keyboard");
+        const cb = (m: Modality) => setVisible(m === "keyboard");
+        subscribers.add(cb);
+        return () => {
+            subscribers.delete(cb);
+        };
+    }, []);
+    return visible;
+};