fix(print): auto-start capture and surface listener state

src/main.ts

@@ -90,6 +90,7 @@ let bundleType: BundleType | null = null
 let availableUpdate: Update | null = null
 let availableManualUpdate: ManualUpdate | null = null
 let updateBusy = false
+let captureError: string | null = null
 let systemPrinters: SystemPrinter[] = []
 let virtualPrinterStatus: VirtualPrinterStatus | null = null
 
@@ -286,12 +287,22 @@ async function refreshPrinters() {
 
 function render() {
   const pill = el<HTMLDivElement>('status-pill')
-  pill.classList.toggle('live', status?.running ?? false)
+  pill.classList.toggle('live', (status?.running ?? false) && !captureError)
-  pill.querySelector('span:last-child')!.textContent = status?.running ? `Capturing · ${status.mode}` : 'Stopped'
+  pill.querySelector('span:last-child')!.textContent = captureError
+    ? 'Capture error'
+    : status?.running
+      ? `Capturing · ${status.mode}`
+      : 'Stopped'
   el('job-count').textContent = String(status?.jobs ?? jobs.length)
   el('code-count').textContent = String(jobs.reduce((sum, job) => sum + job.barcodes.length, 0))
   el('pending-count').textContent = String(status?.pending ?? 0)
-  el('job-hint').textContent = jobs.length ? `${jobs.length} retained locally` : 'Waiting for capture'
+  el('job-hint').textContent = captureError
+    ? `Capture unavailable: ${captureError}`
+    : jobs.length
+      ? `${jobs.length} retained locally`
+      : status?.running
+        ? 'Ready for print jobs'
+        : 'Capture stopped'
 
   el('jobs').innerHTML = jobs.length ? jobs.map((job) => `
     <article class="job">
@@ -313,6 +324,22 @@ async function refreshStatus() {
   render()
 }
 
+async function ensureCaptureStarted() {
+  try {
+    await invoke('start_capture')
+    captureError = null
+  } catch (error) {
+    captureError = String(error)
+  }
+  await refreshStatus()
+  return !captureError
+}
+
+async function restartCapture() {
+  await invoke('stop_capture').catch(() => undefined)
+  return ensureCaptureStarted()
+}
+
 el('forwardPrinter').addEventListener('change', () => {
   const selected = systemPrinters.find((printer) => printer.name === el<HTMLSelectElement>('forwardPrinter').value)
   if (selected?.address) {
@@ -339,6 +366,7 @@ el('install-printer').addEventListener('click', async () => {
   try {
     virtualPrinterStatus = await invoke<VirtualPrinterStatus>('install_virtual_printer', { targetPrinter })
     config = await invoke<AppConfig>('save_config', { config: readForm() })
+    await restartCapture()
     await refreshPrinters()
   } catch (error) {
     state.textContent = `Printer setup failed: ${String(error)}`
@@ -365,16 +393,17 @@ el('remove-printer').addEventListener('click', async () => {
 el('save').addEventListener('click', async () => {
   config = await invoke<AppConfig>('save_config', { config: readForm() })
   writeForm(config)
-  await refreshStatus()
+  if (status?.running) await restartCapture()
+  else await refreshStatus()
 })
 
 el('start').addEventListener('click', async () => {
   config = await invoke<AppConfig>('save_config', { config: readForm() })
-  await invoke('start_capture')
+  await restartCapture()
-  await refreshStatus()
 })
 
 el('stop').addEventListener('click', async () => {
+  captureError = null
   await invoke('stop_capture')
   await refreshStatus()
 })
@@ -565,7 +594,8 @@ await listen<Job>('capture-job', (event) => {
 
 config = await invoke<AppConfig>('get_config')
 writeForm(config)
-await Promise.all([refreshStatus(), refreshPrinters()])
+await refreshPrinters()
+await ensureCaptureStarted()
 
 currentVersion = await getVersion()
 bundleType = await getBundleType().catch(() => null)