[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/internal/routemanager/manager.go

@@ -442,6 +442,11 @@ func (m *DefaultManager) UpdateRoutes(
 
 		m.updateClientNetworks(updateSerial, filteredClientRoutes)
 		m.notifier.OnNewRoutes(filteredClientRoutes)
+		// A new network map can add or drop route/exit-node candidates without
+		// touching any peer's chosen-route state, so the peer status alone
+		// wouldn't notify SubscribeStatus subscribers. Bump the revision so the
+		// UI re-fetches ListNetworks.
+		m.statusRecorder.BumpNetworksRevision()
 	}
 	m.clientRoutes = clientRoutes
 
@@ -582,6 +587,10 @@ func (m *DefaultManager) TriggerSelection(networks route.HAMap) {
 	if err := m.stateManager.UpdateState((*SelectorState)(m.routeSelector)); err != nil {
 		log.Errorf("failed to update state: %v", err)
 	}
+
+	// A selection change flips Network.selected without altering the candidate
+	// set, so bump the revision to push the new state to the UI.
+	m.statusRecorder.BumpNetworksRevision()
 }
 
 // stopObsoleteClients stops the client network watcher for the networks that are not in the new list