fix(android): pairing QR now actually scannable

Camera decode failed because every lever was at its minimum: the web
modal generated the QR at 112px (~2.5px per module before upscaling),
the analysis stream was CameraX's 640x480 default, and ZXing ran
without TRY_HARDER. Generate the QR at 512px (displayed 192px with a
real quiet zone), analyze at 1280x720, decode with TRY_HARDER plus an
inverted-luminance fallback. v0.4.14 (versionCode 18).

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 = 17
-        versionName = "0.4.13"
+        versionCode = 18
+        versionName = "0.4.14"
 
         vectorDrawables {
             useSupportLibrary = true

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

@@ -239,7 +239,12 @@ private 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.
+            @Suppress("DEPRECATION")
             val analysis = ImageAnalysis.Builder()
+                .setTargetResolution(android.util.Size(1280, 720))
                 .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
                 .build()
                 .also {
@@ -268,7 +273,14 @@ private fun CameraQrPreview(onDecoded: (String) -> Unit) {
 /** ZXing-based QR decoder over the camera's Y (luminance) plane. */
 private class QrCodeAnalyzer(private val onDecoded: (String) -> Unit) : ImageAnalysis.Analyzer {
     private val reader = MultiFormatReader().apply {
-        setHints(mapOf(DecodeHintType.POSSIBLE_FORMATS to listOf(BarcodeFormat.QR_CODE)))
+        setHints(
+            mapOf(
+                DecodeHintType.POSSIBLE_FORMATS to listOf(BarcodeFormat.QR_CODE),
+                // Screen-displayed QRs come with moiré, glare, and soft focus at
+                // close range — the exhaustive search is worth the milliseconds.
+                DecodeHintType.TRY_HARDER to true,
+            )
+        )
     }
 
     override fun analyze(image: ImageProxy) {
@@ -284,7 +296,13 @@ private class QrCodeAnalyzer(private val onDecoded: (String) -> Unit) : ImageAna
                 0, 0, image.width, image.height,
                 false,
             )
-            val result = reader.decodeWithState(BinaryBitmap(HybridBinarizer(source)))
+            val result = try {
+                reader.decodeWithState(BinaryBitmap(HybridBinarizer(source)))
+            } catch (_: NotFoundException) {
+                // Dark-themed pages can render light-on-dark QRs — retry inverted.
+                reader.reset()
+                reader.decodeWithState(BinaryBitmap(HybridBinarizer(source.invert())))
+            }
             onDecoded(result.text)
         } catch (_: NotFoundException) {
             // No QR in this frame — keep scanning.