Add shared PasswordVisibilityToggle design-system component

Extract the show/hide password trailing-icon into a reusable
PasswordVisibilityToggle so every password field reveals plaintext the
same way and announces the same a11y labels. Reuse it from the login and
reset-identity password fields. Pure refactor, no behaviour change.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

features/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/loginpassword/LoginPasswordView.kt

@@ -60,6 +60,7 @@ import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.components.Button
 import io.element.android.libraries.designsystem.theme.components.Icon
+import io.element.android.libraries.designsystem.theme.components.PasswordVisibilityToggle
 import io.element.android.libraries.designsystem.theme.components.Scaffold
 import io.element.android.libraries.designsystem.theme.components.TextField
 import io.element.android.libraries.designsystem.theme.components.TopAppBar
@@ -249,16 +250,10 @@ private fun LoginForm(
             placeholder = stringResource(CommonStrings.common_password),
             visualTransformation = if (passwordVisible) VisualTransformation.None else PasswordVisualTransformation(),
             trailingIcon = {
-                val image =
-                    if (passwordVisible) CompoundIcons.VisibilityOn() else CompoundIcons.VisibilityOff()
-                val description =
-                    if (passwordVisible) stringResource(CommonStrings.a11y_hide_password) else stringResource(CommonStrings.a11y_show_password)
-                Box(Modifier.clickable { passwordVisible = !passwordVisible }) {
-                    Icon(
-                        imageVector = image,
-                        contentDescription = description,
-                    )
-                }
+                PasswordVisibilityToggle(
+                    visible = passwordVisible,
+                    onToggle = { passwordVisible = !passwordVisible },
+                )
             },
             keyboardOptions = KeyboardOptions(
                 keyboardType = KeyboardType.Password,

features/securebackup/impl/src/main/kotlin/io/element/android/features/securebackup/impl/reset/password/ResetIdentityPasswordView.kt

@@ -8,8 +8,6 @@
 
 package io.element.android.features.securebackup.impl.reset.password
 
-import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
@@ -32,7 +30,7 @@ import io.element.android.libraries.designsystem.modifiers.onTabOrEnterKeyFocusN
 import io.element.android.libraries.designsystem.preview.ElementPreview
 import io.element.android.libraries.designsystem.preview.PreviewsDayNight
 import io.element.android.libraries.designsystem.theme.components.Button
-import io.element.android.libraries.designsystem.theme.components.Icon
+import io.element.android.libraries.designsystem.theme.components.PasswordVisibilityToggle
 import io.element.android.libraries.designsystem.theme.components.TextField
 import io.element.android.libraries.designsystem.theme.components.TextFieldValidity
 import io.element.android.libraries.ui.strings.CommonStrings
@@ -92,14 +90,10 @@ private fun Content(text: String, onTextChange: (String) -> Unit, hasError: Bool
         singleLine = true,
         visualTransformation = if (showPassword) VisualTransformation.None else PasswordVisualTransformation(),
         trailingIcon = {
-            val image =
-                if (showPassword) CompoundIcons.VisibilityOn() else CompoundIcons.VisibilityOff()
-            val description =
-                if (showPassword) stringResource(CommonStrings.a11y_hide_password) else stringResource(CommonStrings.a11y_show_password)
-
-            Box(Modifier.clickable { showPassword = !showPassword }) {
-                Icon(imageVector = image, description)
-            }
+            PasswordVisibilityToggle(
+                visible = showPassword,
+                onToggle = { showPassword = !showPassword },
+            )
         },
         validity = if (hasError) TextFieldValidity.Invalid else TextFieldValidity.None,
         supportingText = if (hasError) {

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/theme/components/PasswordVisibilityToggle.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2026 Element Creations Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.designsystem.theme.components
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import io.element.android.compound.tokens.generated.CompoundIcons
+import io.element.android.libraries.ui.strings.CommonStrings
+
+/**
+ * Show/hide toggle for a password [TextField], intended for its `trailingIcon` slot.
+ * Shared so every password field reveals plaintext the same way and announces the
+ * same accessibility labels.
+ */
+@Composable
+fun PasswordVisibilityToggle(
+    visible: Boolean,
+    onToggle: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Box(modifier.clickable(onClick = onToggle)) {
+        Icon(
+            imageVector = if (visible) CompoundIcons.VisibilityOn() else CompoundIcons.VisibilityOff(),
+            contentDescription = stringResource(
+                if (visible) CommonStrings.a11y_hide_password else CommonStrings.a11y_show_password
+            ),
+        )
+    }
+}