feat(setup): Zeus lightning journey — fund-wallet step, IBD timer + finish-setup toast, channel suggestions

Every Lightning setup (Open a Shop, Accept Payments, Run a Lightning Node)
gains a guided path to a working channel:

- New "Fund Your Bitcoin Wallet" step, gated on the blockchain finishing
  its initial sync: while syncing it shows a live progress bar with a
  counting-down time-remaining estimate; once synced it shows the on-chain
  balance and a "Fund Wallet" button that opens the receive modal with a
  fresh address, QR, and the Zeus channel limits (min 150,000 / max
  1,500,000 sats) noted.
- When the sync finishes while a Lightning setup is mid-flight, a toast
  pops with a "Finish setup" link straight back to the wizard (toasts now
  support action links). If several setups are in flight, one is chosen —
  the shared steps complete the lightning part of any of them.
- Channel steps are Zeus-branded (logo + copy) and land on the Lightning
  Channels screen, which now carries an "Open a channel with Zeus" card
  that prefills the open-channel modal with the Olympus peer URI, 150k
  sats, and private-channel checked. "Get Zeus" links to zeusln.com.
- Setup completion now actually requires walking the manual steps (fund,
  open channel, configure) — previously any step whose app was installed
  was silently auto-ticked and running apps marked the whole goal done.
- Completion CTAs now go to the app you just set up ("Go to my shop
  (BTCPay)" etc.) instead of the generic services list; iframe apps open
  in the on-top app overlay.
- On-chain send modal gains a "Send all funds" sweep toggle, backed by
  LND's send_all on the backend (amount no longer required when sweeping).
- Demo/mock: bitcoin.getinfo now returns the block_height/sync_progress
  contract the UI reads and simulates a ~90s IBD ramp per visitor so the
  timer, toast, and fund flow can all be demoed live; channel list data
  fixed (status/channel_point/liquidity totals — the panel previously
  crashed on the missing status field); sendcoins supports send_all.

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

neode-ui/src/composables/useBitcoinSync.ts

@@ -0,0 +1,109 @@
+import { ref, computed } from 'vue'
+import { rpcClient } from '@/api/rpc-client'
+
+/**
+ * Shared bitcoin sync (IBD) tracker with a live time-remaining estimate.
+ *
+ * Polls `bitcoin.getinfo` while at least one consumer holds an acquire()
+ * lease, samples the sync rate, and exposes a ticking countdown so setup
+ * screens can show "~2h 14m remaining" that visibly counts down between
+ * polls. Module-level singleton — every consumer sees the same state.
+ */
+
+/** Sync fraction (as percent) at which we consider IBD done, matching the Home tile */
+export const IBD_SYNCED_AT = 99.9
+
+const POLL_MS = 15_000
+const TICK_MS = 1_000
+/** Ignore rate samples older than this when estimating */
+const SAMPLE_WINDOW_MS = 10 * 60_000
+
+export const bitcoinSyncPercent = ref(0)
+export const bitcoinBlockHeight = ref(0)
+export const bitcoinSyncAvailable = ref(false)
+export const bitcoinSyncLoaded = ref(false)
+export const bitcoinSynced = computed(() => bitcoinSyncLoaded.value && bitcoinSyncPercent.value >= IBD_SYNCED_AT)
+
+const etaSeconds = ref<number | null>(null)
+
+/** Human countdown like "2h 14m" / "5m 12s" / "less than a minute", or '' while estimating */
+export const bitcoinSyncEtaText = computed(() => {
+  const s = etaSeconds.value
+  if (s === null) return ''
+  if (s < 60) return 'less than a minute'
+  const h = Math.floor(s / 3600)
+  const m = Math.floor((s % 3600) / 60)
+  if (h > 0) return `${h}h ${m}m`
+  const sec = Math.floor(s % 60)
+  return `${m}m ${sec}s`
+})
+
+let samples: { t: number; p: number }[] = []
+let etaBase: { at: number; secs: number } | null = null
+let pollTimer: ReturnType<typeof setInterval> | null = null
+let tickTimer: ReturnType<typeof setInterval> | null = null
+let leases = 0
+
+async function poll() {
+  try {
+    const btc = await rpcClient.call<{ block_height: number; sync_progress: number }>({
+      method: 'bitcoin.getinfo',
+      timeout: 8000,
+    })
+    const pct = (btc.sync_progress ?? 0) * 100
+    bitcoinSyncPercent.value = pct
+    bitcoinBlockHeight.value = btc.block_height ?? 0
+    bitcoinSyncAvailable.value = true
+    bitcoinSyncLoaded.value = true
+
+    const now = Date.now()
+    samples.push({ t: now, p: pct })
+    samples = samples.filter((s) => now - s.t <= SAMPLE_WINDOW_MS).slice(-50)
+
+    if (pct >= IBD_SYNCED_AT) {
+      etaBase = null
+      etaSeconds.value = 0
+      return
+    }
+    const first = samples[0]
+    if (first && now - first.t >= 10_000 && pct > first.p) {
+      const ratePerSec = (pct - first.p) / ((now - first.t) / 1000)
+      etaBase = { at: now, secs: (IBD_SYNCED_AT - pct) / ratePerSec }
+    }
+  } catch {
+    bitcoinSyncAvailable.value = false
+  }
+}
+
+function tick() {
+  if (!etaBase) {
+    if (!bitcoinSynced.value) etaSeconds.value = null
+    return
+  }
+  etaSeconds.value = Math.max(0, etaBase.secs - (Date.now() - etaBase.at) / 1000)
+}
+
+/**
+ * Hold a polling lease. Returns a release function — call it on unmount.
+ * Polling only runs while at least one lease is held.
+ */
+export function acquireBitcoinSync(): () => void {
+  leases++
+  if (leases === 1) {
+    void poll()
+    pollTimer = setInterval(() => void poll(), POLL_MS)
+    tickTimer = setInterval(tick, TICK_MS)
+  }
+  let released = false
+  return () => {
+    if (released) return
+    released = true
+    leases = Math.max(0, leases - 1)
+    if (leases === 0) {
+      if (pollTimer) clearInterval(pollTimer)
+      if (tickTimer) clearInterval(tickTimer)
+      pollTimer = null
+      tickTimer = null
+    }
+  }
+}