[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/build/linux/nfpm/nfpm.yaml

@@ -0,0 +1,70 @@
+# Feel free to remove those if you don't want/need to use them.
+# Make sure to check the documentation at https://nfpm.goreleaser.com
+#
+# The lines below are called `modelines`. See `:help modeline`
+
+name: "netbird-ui"
+arch: ${GOARCH}
+platform: "linux"
+version: "0.0.1"
+section: "default"
+priority: "extra"
+maintainer: ${GIT_COMMITTER_NAME} <${GIT_COMMITTER_EMAIL}>
+description: "NetBird desktop client"
+vendor: "NetBird"
+homepage: "https://wails.io"
+license: "MIT"
+release: "1"
+
+contents:
+  - src: "./bin/netbird-ui"
+    dst: "/usr/local/bin/netbird-ui"
+  - src: "./build/appicon.png"
+    dst: "/usr/share/icons/hicolor/128x128/apps/netbird-ui.png"
+  - src: "./build/linux/netbird-ui.desktop"
+    dst: "/usr/share/applications/netbird-ui.desktop"
+
+# Default dependencies for the GTK4 + WebKitGTK 6.0 stack (Ubuntu 24.04+ / Debian 13+)
+depends:
+  - libgtk-4-1
+  - libwebkitgtk-6.0-4
+  - xdg-utils
+
+# Distribution-specific overrides for different package formats
+overrides:
+  # RPM packages for Fedora / RHEL / AlmaLinux / Rocky Linux
+  rpm:
+    depends:
+      - gtk4
+      - webkitgtk6.0
+      - xdg-utils
+
+  # Arch Linux packages
+  archlinux:
+    depends:
+      - gtk4
+      - webkitgtk-6.0
+      - xdg-utils
+
+# scripts section to ensure desktop database is updated after install
+scripts:
+  postinstall: "./build/linux/nfpm/scripts/postinstall.sh"
+  # You can also add preremove, postremove if needed
+  # preremove: "./build/linux/nfpm/scripts/preremove.sh"
+  # postremove: "./build/linux/nfpm/scripts/postremove.sh"
+
+# replaces:
+#   - foobar
+# provides:
+#   - bar
+# depends:
+#   - gtk3
+#   - libwebkit2gtk
+# recommends:
+#   - whatever
+# suggests:
+#   - something-else
+# conflicts:
+#   - not-foo
+#   - not-bar
+# changelog: "changelog.yaml"

client/ui/build/linux/nfpm/scripts/postinstall.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# Update desktop database for .desktop file changes
+# This makes the application appear in application menus and registers its capabilities.
+if command -v update-desktop-database >/dev/null 2>&1; then
+  echo "Updating desktop database..."
+  update-desktop-database -q /usr/share/applications
+else
+  echo "Warning: update-desktop-database command not found. Desktop file may not be immediately recognized." >&2
+fi
+
+# Update MIME database for custom URL schemes (x-scheme-handler)
+# This ensures the system knows how to handle your custom protocols.
+if command -v update-mime-database >/dev/null 2>&1; then
+  echo "Updating MIME database..."
+  update-mime-database -n /usr/share/mime
+else
+  echo "Warning: update-mime-database command not found. Custom URL schemes may not be immediately recognized." >&2
+fi
+
+exit 0

client/ui/build/linux/nfpm/scripts/postremove.sh

@@ -0,0 +1 @@
+#!/bin/bash

client/ui/build/linux/nfpm/scripts/preinstall.sh

@@ -0,0 +1 @@
+#!/bin/bash

client/ui/build/linux/nfpm/scripts/preremove.sh

@@ -0,0 +1 @@
+#!/bin/bash