fix(audit): mobile i18n + offline share + silent catches + mobile fixes

Mobile i18n (nouveau système):
- lib/i18n.ts: traductions FR/EN/FA + détection locale + RTL (I18nManager)
- (tabs)/_layout.tsx: titres tabs via t()
- 50+ clés traduites par langue

Mobile fixes:
- TitleSheet: dependency array [visible] → [visible, content]
- Partage: inclut extrait contenu + lien public si publié
- Édition: message i18n 'utilisez la version web'

Web fixes:
- 28 silent catches → console.error('[silent-catch]', e)
- Web Clipper: host_permissions déjà restreints dans dist-chrome-store

memento-mobile/app/(tabs)/_layout.tsx

@@ -1,6 +1,7 @@
 import { Tabs } from 'expo-router'
 import { BookOpen, Search, Home, User, GraduationCap } from 'lucide-react-native'
 import { C } from '@/lib/theme'
+import { t } from '@/lib/i18n'
 
 export default function TabsLayout() {
   return (
@@ -13,11 +14,11 @@ export default function TabsLayout() {
         tabBarLabelStyle: { fontSize: 10, fontWeight: '600', marginTop: -2 },
       }}
     >
-      <Tabs.Screen name="home" options={{ title: 'Accueil', tabBarIcon: ({ color, size }) => <Home size={size} color={color} /> }} />
-      <Tabs.Screen name="notebooks" options={{ title: 'Carnets', tabBarIcon: ({ color, size }) => <BookOpen size={size} color={color} /> }} />
-      <Tabs.Screen name="revision" options={{ title: 'Révision', tabBarIcon: ({ color, size }) => <GraduationCap size={size} color={color} /> }} />
-      <Tabs.Screen name="search" options={{ title: 'Recherche', tabBarIcon: ({ color, size }) => <Search size={size} color={color} /> }} />
-      <Tabs.Screen name="profile" options={{ title: 'Profil', tabBarIcon: ({ color, size }) => <User size={size} color={color} /> }} />
+      <Tabs.Screen name="home" options={{ title: t('tab.home'), tabBarIcon: ({ color, size }) => <Home size={size} color={color} /> }} />
+      <Tabs.Screen name="notebooks" options={{ title: t('tab.notebooks'), tabBarIcon: ({ color, size }) => <BookOpen size={size} color={color} /> }} />
+      <Tabs.Screen name="revision" options={{ title: t('tab.revision'), tabBarIcon: ({ color, size }) => <GraduationCap size={size} color={color} /> }} />
+      <Tabs.Screen name="search" options={{ title: t('tab.search'), tabBarIcon: ({ color, size }) => <Search size={size} color={color} /> }} />
+      <Tabs.Screen name="profile" options={{ title: t('tab.profile'), tabBarIcon: ({ color, size }) => <User size={size} color={color} /> }} />
     </Tabs>
   )
 }