[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>

docs/netbird.adml

@@ -60,6 +60,9 @@
       <string id="DisableNetworks_Name">Disable networks</string>
       <string id="DisableNetworks_Help">When enabled, the client UI/CLI cannot list, select or deselect NetBird networks (the corresponding daemon RPCs return Unavailable). Equivalent to --disable-networks.</string>
 
+      <string id="DisableAdvancedView_Name">Disable advanced view</string>
+      <string id="DisableAdvancedView_Help">When enabled, the client UI hides the advanced-view section of the new UI revision. Tristate at the daemon: 1 (enabled) hides the section; 0 (disabled) explicitly shows it; not configured leaves the UI's default behavior in place. MDM is the sole source — no equivalent CLI flag exists.</string>
+
       <string id="DisableMetricsCollection_Name">Disable metrics collection</string>
       <string id="DisableMetricsCollection_Help">When enabled, the client does not collect or report local usage metrics.</string>