feat(wallet): real-time tx push — 0-conf shows in seconds, not on poll

Backend streams LND /v1/transactions/subscribe (fires on mempool arrival
and each confirmation) and nudges the /ws/db revision per event; the Home
wallet card subscribes and refetches (debounced 800ms). An incoming
broadcast now appears while the 30s poll is still asleep. Reconnects
forever with capped backoff when LND is down/locked/absent.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/Home.vue

@@ -300,6 +300,8 @@ import TransactionsModal from '@/components/TransactionsModal.vue'
 import WalletSettingsModal from '@/components/WalletSettingsModal.vue'
 import { useAppStore } from '../stores/app'
 import { useAppLauncherStore } from '@/stores/appLauncher'
+import { wsClient } from '@/api/websocket'
+import { useTxExplorer } from '@/composables/useTxExplorer'
 import { useLoginTransitionStore } from '../stores/loginTransition'
 import { useUIModeStore } from '@/stores/uiMode'
 import { useHomeStatusStore } from '@/stores/homeStatus'
@@ -360,6 +362,8 @@ onBeforeUnmount(() => {
   if (typingInterval) clearInterval(typingInterval)
   if (systemStatsInterval) clearInterval(systemStatsInterval)
   if (walletRefreshInterval) clearInterval(walletRefreshInterval)
+  if (unsubscribeWs) { unsubscribeWs(); unsubscribeWs = null }
+  if (wsWalletDebounce) clearTimeout(wsWalletDebounce)
 })
 
 watch(() => loginTransition.pendingWelcomeTyping, (pending) => { if (pending) showWelcomeBlock.value = true })
@@ -524,6 +528,15 @@ onMounted(async () => {
   // pending on-chain receive (or a fresh instant payment) only shows up
   // after a manual wallet action or a remount.
   walletRefreshInterval = setInterval(loadWeb5Status, 30000)
+  // Real-time wallet push (2026-07-22): the backend streams LND transaction
+  // events and nudges /ws/db the moment a tx hits the mempool. Any push =
+  // something changed → refetch the wallet (debounced; the RPC is cheap).
+  // This is what makes an incoming 0-conf tx appear in seconds instead of
+  // waiting out the 30s poll above.
+  unsubscribeWs = wsClient.subscribe(() => {
+    if (wsWalletDebounce) clearTimeout(wsWalletDebounce)
+    wsWalletDebounce = setTimeout(() => { void loadWeb5Status() }, 800)
+  })
 })
 
 // Wallet modals
@@ -535,8 +548,10 @@ const walletConnected = ref(false); const walletOnchain = ref(0); const walletLi
 const walletArk = ref(0)
 const walletTransactions = ref<WalletTransaction[]>([])
 
-// Overlay the explorer above the current page — never navigate away.
-function openInMempool(txHash: string) { useAppLauncherStore().openSession('mempool', { path: `/tx/${txHash}` }) }
+// Overlay the local Mempool app when it's running; otherwise route through
+// the external-explorer consent flow (pruned nodes can't run Mempool).
+const txExplorer = useTxExplorer()
+function openInMempool(txHash: string) { txExplorer.openTx(txHash) }
 
 // wallet.ecash-history's shape (see handle_wallet_ecash_history in
 // api/rpc/wallet.rs) — distinct from the LND-shaped WalletTransaction used
@@ -600,6 +615,8 @@ const systemUptimeDisplay = computed(() => { if (homeStatus.stats.uptimeSecs ===
 
 let systemStatsInterval: ReturnType<typeof setInterval> | null = null
 let walletRefreshInterval: ReturnType<typeof setInterval> | null = null
+let unsubscribeWs: (() => void) | null = null
+let wsWalletDebounce: ReturnType<typeof setTimeout> | null = null
 
 async function loadSystemStats() {
   await homeStatus.refresh(packages.value)