Stop prompting system password restore on PIN entry in regV5.

feature/registration/src/main/java/org/signal/registration/screens/PinVisualTransformation.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2026 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.signal.registration.screens
+
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.input.OffsetMapping
+import androidx.compose.ui.text.input.PasswordVisualTransformation
+import androidx.compose.ui.text.input.TransformedText
+import androidx.compose.ui.text.input.VisualTransformation
+
+/**
+ * Masks input with bullets exactly like [PasswordVisualTransformation], but is intentionally a
+ * distinct type. Compose flags a field with password semantics whenever its transformation is a
+ * [PasswordVisualTransformation], which makes the system autofill framework offer to save/fill a
+ * password. We never want that prompt for PIN entry.
+ */
+object PinVisualTransformation : VisualTransformation {
+  private const val MASK = '•'
+
+  override fun filter(text: AnnotatedString): TransformedText {
+    return TransformedText(
+      AnnotatedString(MASK.toString().repeat(text.text.length)),
+      OffsetMapping.Identity
+    )
+  }
+}

feature/registration/src/main/java/org/signal/registration/screens/pincreation/PinCreationScreen.kt

@@ -57,7 +57,6 @@ import androidx.compose.ui.text.SpanStyle
 import androidx.compose.ui.text.buildAnnotatedString
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.KeyboardType
-import androidx.compose.ui.text.input.PasswordVisualTransformation
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.text.withStyle
@@ -71,6 +70,7 @@ import org.signal.core.ui.compose.Previews
 import org.signal.core.ui.compose.Scaffolds
 import org.signal.core.ui.compose.SignalIcons
 import org.signal.registration.R
+import org.signal.registration.screens.PinVisualTransformation
 import org.signal.registration.screens.RegistrationScaffold
 import org.signal.registration.screens.TwoPaneRegistrationScaffold
 import org.signal.registration.screens.attachDebugLogHelper
@@ -399,7 +399,7 @@ private fun PinInputField(
       imeAction = ImeAction.Done
     ),
     keyboardActions = KeyboardActions(onDone = { if (canSubmitPin) onSubmit() }),
-    visualTransformation = PasswordVisualTransformation()
+    visualTransformation = PinVisualTransformation
   )
 }
 

feature/registration/src/main/java/org/signal/registration/screens/pinentry/PinEntryScreen.kt

@@ -43,7 +43,6 @@ import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.KeyboardType
-import androidx.compose.ui.text.input.PasswordVisualTransformation
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import org.signal.core.ui.compose.AllDevicePreviews
@@ -52,6 +51,7 @@ import org.signal.core.ui.compose.Dialogs
 import org.signal.core.ui.compose.Previews
 import org.signal.core.ui.compose.SignalIcons
 import org.signal.registration.R
+import org.signal.registration.screens.PinVisualTransformation
 import org.signal.registration.screens.RegistrationScaffold
 import org.signal.registration.screens.TwoPaneRegistrationScaffold
 import org.signal.registration.screens.attachDebugLogHelper
@@ -326,7 +326,7 @@ private fun PinInputField(
       ),
       keyboardActions = KeyboardActions(onDone = { if (canSubmitPin) onSubmit() }),
       isError = state.triesRemaining != null,
-      visualTransformation = PasswordVisualTransformation()
+      visualTransformation = PinVisualTransformation
     )
 
     if (state.triesRemaining != null) {