Add account sync button to super user toolbar

Wires the existing POST /api/v1/admin/accounts/sync endpoint into the
Castle index toolbar (sync icon between permissions and settings).
Surfaces sync stats (added/reactivated/deactivated/virtual_parents/errors)
via a Quasar notification and refreshes the accounts list on success.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

static/js/index.js

@@ -34,6 +34,7 @@ window.app = Vue.createApp({
       settingsLoaded: false, // Flag to prevent race conditions on toolbar buttons
       castleWalletConfigured: false,
       userWalletConfigured: false,
+      syncingAccounts: false,
       currentExchangeRate: null, // BTC/EUR rate (sats per EUR)
       expenseDialog: {
         show: false,
@@ -539,6 +540,32 @@ window.app = Vue.createApp({
         this.userWalletConfigured = false
       }
     },
+    async syncAccounts() {
+      this.syncingAccounts = true
+      try {
+        const {data} = await LNbits.api.request(
+          'POST',
+          '/castle/api/v1/admin/accounts/sync',
+          this.g.user.wallets[0].adminkey
+        )
+        const errors = (data?.errors || []).length
+        const message = `Synced: ${data?.accounts_added ?? 0} added, ` +
+          `${data?.accounts_reactivated ?? 0} reactivated, ` +
+          `${data?.accounts_deactivated ?? 0} deactivated, ` +
+          `${data?.virtual_parents_created ?? 0} virtual parents` +
+          (errors ? `, ${errors} errors` : '')
+        this.$q.notify({
+          type: errors ? 'warning' : 'positive',
+          message,
+          timeout: errors ? 8000 : 4000
+        })
+        await this.loadAccounts()
+      } catch (error) {
+        LNbits.utils.notifyApiError(error)
+      } finally {
+        this.syncingAccounts = false
+      }
+    },
     showSettingsDialog() {
       this.settingsDialog.castleWalletId = this.settings?.castle_wallet_id || ''
       this.settingsDialog.favaUrl = this.settings?.fava_url || 'http://localhost:3333'