fix(companion): wallet scanner reads dense invoice QRs — 0.5.22

Root cause (diagnosed live via CDP on a Pixel 9a): camera permission
granted and the native camera streamed (2m35s active) but ZXing returned
zero decodes for Lightning-invoice QRs — window.__archyQrResult received
0 calls. Dense BOLT11 codes need more pixels/module AND sharp focus; the
9a's main lens rests at a far focus and 1280x720 wasn't enough, so dense
invoices never resolved while sparse address QRs did. Fix: analysis at
1920x1080 + a repeating centre autofocus tick (a static hand-held QR
never retriggers continuous-AF on its own).

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

Android/app/build.gradle.kts

@@ -11,8 +11,8 @@ android {
         applicationId = "com.archipelago.app"
         minSdk = 26
         targetSdk = 35
-        versionCode = 41
-        versionName = "0.5.21"
+        versionCode = 42
+        versionName = "0.5.22"
 
         vectorDrawables {
             useSupportLibrary = true

Android/app/src/main/java/com/archipelago/app/ui/components/QrScannerOverlay.kt

@@ -238,6 +238,7 @@ internal fun CameraQrPreview(onDecoded: (String) -> Unit) {
         val mainExecutor = ContextCompat.getMainExecutor(context)
         val providerFuture = ProcessCameraProvider.getInstance(context)
         var provider: ProcessCameraProvider? = null
+        val focusScheduler = Executors.newSingleThreadScheduledExecutor()
 
         providerFuture.addListener({
             val p = providerFuture.get()
@@ -245,12 +246,15 @@ internal fun CameraQrPreview(onDecoded: (String) -> Unit) {
             val preview = Preview.Builder().build().also {
                 it.setSurfaceProvider(previewView.surfaceProvider)
             }
-            // CameraX's analysis default is 640x480 — too few pixels per module
-            // to decode a modal-sized QR at arm's length. 1280x720 more than
-            // doubles the pixel density at negligible analysis cost.
+            // Dense Lightning-invoice QRs need BOTH enough pixels per module and
+            // sharp focus. 1280x720 + a far-focused camera (e.g. Pixel 9a's main
+            // lens, which won't focus close) left dense invoices undecodable
+            // while sparse address QRs still read — the "scanner doesn't pick up
+            // invoices" report. 1920x1080 roughly doubles module resolution so a
+            // QR held at the camera's actual focus distance still resolves.
             @Suppress("DEPRECATION")
             val analysis = ImageAnalysis.Builder()
-                .setTargetResolution(android.util.Size(1280, 720))
+                .setTargetResolution(android.util.Size(1920, 1080))
                 .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
                 .build()
                 .also {
@@ -261,13 +265,27 @@ internal fun CameraQrPreview(onDecoded: (String) -> Unit) {
                 }
             try {
                 p.unbindAll()
-                p.bindToLifecycle(lifecycleOwner, CameraSelector.DEFAULT_BACK_CAMERA, preview, analysis)
+                val cam = p.bindToLifecycle(lifecycleOwner, CameraSelector.DEFAULT_BACK_CAMERA, preview, analysis)
+                // Force a centre autofocus on a repeating tick. A hand-held QR is
+                // a static scene, so continuous-AF often never retriggers and the
+                // lens sits at its resting (far) focus — fatal for dense codes.
+                // A normalized centre point works before the view is measured.
+                val point = androidx.camera.core.SurfaceOrientedMeteringPointFactory(1f, 1f)
+                    .createPoint(0.5f, 0.5f)
+                val focusAction = androidx.camera.core.FocusMeteringAction.Builder(
+                    point,
+                    androidx.camera.core.FocusMeteringAction.FLAG_AF,
+                ).disableAutoCancel().build()
+                focusScheduler.scheduleWithFixedDelay({
+                    runCatching { cam.cameraControl.startFocusAndMetering(focusAction) }
+                }, 0, 2, java.util.concurrent.TimeUnit.SECONDS)
             } catch (_: Exception) {
                 // Camera unavailable — the user can dismiss and enter details manually.
             }
         }, mainExecutor)
 
         onDispose {
+            focusScheduler.shutdownNow()
             provider?.unbindAll()
             analysisExecutor.shutdown()
         }