feat: autopass-based cross-device sync for Holesail Browser

- Native host: add autopass + corestore deps, sync-manager (createInvite, pairWithInvite, push/pull)
- Apply synced state via same flow as backup restore (state.json only, no certs)
- Holesail-manager: setOnStateSaved hook for sync push
- Extension: Sync dashboard page, getSyncStatus/createSyncInvite/pairWithInvite, syncApplied event
- Docs: NATIVE-HOST.md sync commands, SYNC.md

native-host/holesail-manager/index.js

@@ -25,6 +25,17 @@ function emit(event, payload) { if (eventEmit) eventEmit(event, payload); }
 // ── Shared saveState snapshot ─────────────────────────────────────────────────
 // Collects current state from all sub-modules and persists it.
 
+let onStateSaved = null;
+
+/**
+ * Register a callback invoked after each saveState() with the snapshot object.
+ * Used by sync-manager to push state to autopass.
+ * @param {Function} fn - (snapshot: object) => void
+ */
+function setOnStateSaved(fn) {
+  onStateSaved = typeof fn === 'function' ? fn : null;
+}
+
 function saveState() {
   const serversList = serversModule.getServers().map(s => ({
     id: s.id, port: s.port, host: s.host, secure: s.secure, udp: s.udp || false, label: s.label || ''
@@ -34,7 +45,7 @@ function saveState() {
   const serviceTunnelsList = svcModule.getServiceTunnels().map(t => ({
     id: t.id, label: t.label, hsUrl: t.hsUrl, localPort: t.localPort
   }));
-  stateModule.saveStateSync({
+  const snapshot = {
     version: 2,
     settings: settingsModule.getSettings(),
     nextServerId: serversModule.getNextServerId(),
@@ -44,7 +55,9 @@ function saveState() {
     serviceTunnels: serviceTunnelsList,
     sshConnections: connectionsModule.getSshConnections(),
     rdpConnections: connectionsModule.getRdpConnections()
-  });
+  };
+  stateModule.saveStateSync(snapshot);
+  if (onStateSaved) onStateSaved(snapshot);
 }
 
 // Inject the shared saveState and emit callbacks into each sub-module
@@ -113,6 +126,7 @@ module.exports = {
   // Storage
   setStoragePath,
   ensureStorageDir,
+  setOnStateSaved,
   // Settings
   getSettings: settingsModule.getSettings,
   updateSettings: settingsModule.updateSettings,