feat(machine): Bolt Card (NFC) tap-to-receive on cash-in

Tap-to-receive for the buy flow, the receive counterpart to #83's
cash-out tap-to-pay. A Bolt Card only emits an lnurlw withdraw voucher
(wrong direction to deposit into it), so the tap is used as an
authenticated identity (external_id + SUN p/c) to resolve the card
wallet's lnurlp/Lightning Address; the ATM then pays an invoice for the
payout over its existing nostr transport.

- electron/lnurl-pay.ts: resolveCardInvoice() — resolve card -> pay
  target -> LUD-16/LUD-06 -> BOLT11. scanUrlToResolver() is the single
  HTTPS-today / nostr-tomorrow transport seam. 13 tests.
- IPC lnurl:pay-card (main-process HTTPS to dodge renderer CORS) +
  preload/electron.d.ts surface.
- stores/atm.ts: handleBoltCardReceive() settles via the existing
  payInvoice -> PAYMENT_RECEIVED path; the one NFC listener now routes
  the same tap by flow (cash-out pulls, cash-in receives).
- CashInView.vue: NFC status + dev tap input.
- docs/boltcard-receive-resolver.md: spec for the custom LNbits
  /boltcards/api/v1/pay/<id> resolver endpoint (omni-private side).

Card issuance is unchanged — same NDEF/keys/external_id; receive is a
server-side reading of the same tap.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/machine/electron/main.ts

@@ -43,6 +43,7 @@ import {
 } from './state-store.js'
 import { initializeHal, type HalInstance } from './hal-service.js'
 import { executeLnurlWithdraw } from './lnurl-withdraw.js'
+import { resolveCardInvoice } from './lnurl-pay.js'
 import { startNfcReader, type NfcStatus } from './nfc-service.js'
 
 // ESM equivalent of __dirname
@@ -120,9 +121,7 @@ function loadBranding(): BrandingConfig | null {
         if (Object.keys(colors).length > 0) customColors = colors
         if (dark && typeof dark === 'object') {
           const darkColors = Object.fromEntries(
-            Object.entries(dark as Record<string, unknown>).filter(
-              ([, v]) => typeof v === 'string'
-            )
+            Object.entries(dark as Record<string, unknown>).filter(([, v]) => typeof v === 'string')
           ) as Record<string, string>
           if (Object.keys(darkColors).length > 0) customColorsDark = darkColors
         }
@@ -431,6 +430,20 @@ ipcMain.handle(
   }
 )
 
+// Bolt Card cash-in (receive): resolve a tapped card + payout amount to a
+// BOLT11 on the card wallet, which the renderer then pays over the nostr
+// transport (stores/atm.ts payInvoice). HTTPS to the card host runs here in the
+// main process to dodge renderer CORS. See lnurl-pay.ts.
+ipcMain.handle(
+  'lnurl:pay-card',
+  async (
+    _event,
+    args: { lnurlw: string; amountMsat: number }
+  ): Promise<{ ok: boolean; bolt11?: string; reason?: string }> => {
+    return resolveCardInvoice(args.lnurlw, args.amountMsat)
+  }
+)
+
 // State persistence IPC handlers
 ipcMain.handle('state:load-cassettes', () => loadCassettes())
 ipcMain.handle('state:set-cassettes', (_event, cassettes) => setCassettes(cassettes))
@@ -447,9 +460,7 @@ ipcMain.handle('state:remediate-transaction', (_event, txid: string, remediatedB
 ipcMain.handle('state:get-last-known-config-created-at', (): number =>
   getLastKnownConfigCreatedAt()
 )
-ipcMain.handle('state:get-bootstrap-published-at', (): number | null =>
-  getBootstrapPublishedAt()
-)
+ipcMain.handle('state:get-bootstrap-published-at', (): number | null => getBootstrapPublishedAt())
 ipcMain.handle('state:mark-bootstrap-published', (_event, unixTimestamp: number): void => {
   markBootstrapPublished(unixTimestamp)
 })