fix(cassettes): republish after a dispense the renderer didn't run

Two dispense paths bypassed the refresh-and-publish step that cash-out
does. The kind-21003 management command persisted the transaction and
stopped there, and the operator-command poller runs entirely in the main
process, where the renderer cannot see the bays move at all. In both
cases the renderer kept serving a stale inventory and the operator's
cassette view stayed frozen until the next customer cash-out.

The management handler takes an after-hook, and the main process emits
'cassettes:changed' when it mutates the table so the renderer can catch
up. Both land on one helper that reloads the inventory and republishes
the state document.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

apps/machine/electron/main.ts

@@ -841,6 +841,11 @@ function startCommandPoller(): void {
           error: result.error,
         })
 
+        // This dispense happened entirely in the main process, so the renderer
+        // has no idea the bays moved — it would keep serving a stale inventory
+        // and would never republish the operator's view. Tell it.
+        mainWindow?.webContents.send('cassettes:changed')
+
         // Only remediate the original tx if ALL requested bills were dispensed
         let refRemediated = false
         if (parsed.ref_txid && result.dispensed) {

apps/machine/electron/preload.ts

@@ -222,6 +222,13 @@ contextBridge.exposeInMainWorld('electronAPI', {
   // Bolt Card reader (main process → renderer). removeAllListeners first: a
   // renderer reload re-runs this, and a duplicated card-tap listener would
   // trigger the LNURL-withdraw twice.
+  // The main process changed the cassettes table (an operator-command dispense,
+  // boot seeding). The renderer reloads its inventory and republishes state.
+  onCassettesChanged: (callback: () => void) => {
+    ipcRenderer.removeAllListeners('cassettes:changed')
+    ipcRenderer.on('cassettes:changed', () => callback())
+  },
+
   onNfcCardTapped: (callback: (lnurlw: string) => void) => {
     ipcRenderer.removeAllListeners('nfc:card-tapped')
     ipcRenderer.on('nfc:card-tapped', (_event, lnurlw) => callback(lnurlw))