fix(machine): persist transactions stuck in waitingForCashTaken

The IPC HAL path (production) never set halServices.value, so the
auto-advance from waitingForCashTaken → complete never fired. The
machine hung on "Cash Ready!" indefinitely — no transaction persisted.

Three fixes:
- Auto-advance now checks `isElectron` (covers IPC path)
- waitingForCashTaken has a 30s after-timeout as safety net
- Fix unscoped lightningPub refs in LNURL session helpers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/state-machine/src/machine.ts

@@ -703,6 +703,10 @@ export function createATMMachine(
             },
           },
           waitingForCashTaken: {
+            // Auto-advance after 30s — bills are already out, assume taken.
+            after: {
+              30000: 'complete',
+            },
             on: {
               CASH_DISPENSED: 'complete',
               TIMEOUT: 'complete', // Assume taken