feat(rebreak-native): Android counterpart for the app lock

expo-local-authentication already works on Android (fingerprint / face unlock /
device PIN — the module auto-adds the biometric permission, no app.config change
needed). Only the settings description was iOS-flavoured ("Face ID, Touch ID");
add an Android variant and pick by Platform.OS. The lock screen + biometric
prompt strings were already generic.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/rebreak-native/app/settings.tsx

@@ -259,9 +259,11 @@ export default function SettingsScreen() {
         {
           icon: 'lock-closed-outline',
           label: t('settings.app_lock'),
-          sublabel: appLockAvailable
-            ? t('settings.app_lock_desc')
-            : t('settings.app_lock_unavailable'),
+          sublabel: !appLockAvailable
+            ? t('settings.app_lock_unavailable')
+            : Platform.OS === 'ios'
+              ? t('settings.app_lock_desc')
+              : t('settings.app_lock_desc_android'),
           toggle: {
             value: appLockEnabled,
             onValueChange: handleToggleAppLock,

apps/rebreak-native/locales/de.json

@@ -506,7 +506,8 @@
     "section_security": "Sicherheit",
     "app_lock": "App-Sperre",
     "app_lock_desc": "Beim Öffnen mit Face ID, Touch ID oder Code entsperren",
-    "app_lock_unavailable": "Auf diesem Gerät nicht verfügbar"
+    "app_lock_unavailable": "Auf diesem Gerät nicht verfügbar",
+    "app_lock_desc_android": "Beim Öffnen mit Fingerabdruck, Gesichtsentsperrung oder PIN entsperren"
   },
   "device_limit": {
     "title": "Geräte-Limit erreicht",

apps/rebreak-native/locales/en.json

@@ -506,7 +506,8 @@
     "section_security": "Security",
     "app_lock": "App lock",
     "app_lock_desc": "Unlock with Face ID, Touch ID or passcode when opening",
-    "app_lock_unavailable": "Not available on this device"
+    "app_lock_unavailable": "Not available on this device",
+    "app_lock_desc_android": "Unlock with fingerprint, face unlock or PIN when opening"
   },
   "device_limit": {
     "title": "Device limit reached",