restore(mobile): restore mobile/ directory to pre-d2217531 state

Restored mobile/ from d22175310a711e7ebdd8062ae29a54f0136dc3f6^
(parent commit d94e9ca4bc).

Commit d22175310a (google-labs-jules[bot], 2026-03-23T14:45:22Z) introduced
an SSRF security fix for IMAP connections but unintentionally deleted or
truncated a large number of files across the repository, including 24 files
under mobile/.

This commit targets only the mobile/ directory and restores the following
files to their pre-d2217531 state:

- mobile/README.md
- mobile/app.json
- mobile/app/(tabs)/_layout.tsx
- mobile/app/(tabs)/file-detail.tsx  (re-added)
- mobile/app/+not-found.tsx          (re-added)
- mobile/app/_layout.tsx
- mobile/eslint.config.js            (re-added)
- mobile/package-lock.json
- mobile/package.json
- mobile/src/context/ShareContext.tsx
- mobile/src/i18n/de.json            (re-added)
- mobile/src/i18n/en.json            (re-added)
- mobile/src/i18n/es.json            (re-added)
- mobile/src/i18n/fr.json            (re-added)
- mobile/src/i18n/index.ts           (re-added)
- mobile/src/i18n/it.json            (re-added)
- mobile/src/screens/FileDetailScreen.tsx (re-added)
- mobile/src/screens/FilesScreen.tsx
- mobile/src/screens/LoginScreen.tsx
- mobile/src/screens/ProfileScreen.tsx
- mobile/src/screens/UploadScreen.tsx
- mobile/src/screens/WelcomeScreen.tsx
- mobile/src/services/api.ts
- mobile/src/utils/mimeTypes.ts      (re-added)
- mobile/src/utils/normalizeUri.ts   (re-added)

Security fixes introduced by d2217531 that are unrelated to mobile/
(IMAP SSRF fix in app/utils/network.py and app/tasks/imap_tasks.py)
are preserved — this restore targets only files under mobile/.

mobile/src/screens/WelcomeScreen.tsx

@@ -6,6 +6,7 @@
  */
 
 import { useRouter } from "expo-router";
+import * as Linking from "expo-linking";
 import React from "react";
 import {
   Image,
@@ -16,27 +17,31 @@ import {
   View,
 } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
-
-const FEATURES: { icon: string; title: string; description: string }[] = [
-  {
-    icon: "🔍",
-    title: "OCR & Text Extraction",
-    description: "Convert scanned PDFs and images into fully searchable text automatically.",
-  },
-  {
-    icon: "🤖",
-    title: "AI Metadata Extraction",
-    description: "AI classifies documents and pulls out key fields like dates, amounts, and subjects.",
-  },
-  {
-    icon: "☁️",
-    title: "Multi-Cloud Storage",
-    description: "Route processed files to Dropbox, Google Drive, OneDrive, S3, Nextcloud, and more.",
-  },
-];
+import { useLocale, t } from "../i18n";
 
 export default function WelcomeScreen() {
   const router = useRouter();
+  // Subscribe to language changes so translated strings re-render.
+  useLocale();
+
+  const features = [
+    {
+      icon: "🔍",
+      title: t("welcome.feature_ocr_title"),
+      description: t("welcome.feature_ocr_desc"),
+    },
+    {
+      icon: "🤖",
+      title: t("welcome.feature_ai_title"),
+      description: t("welcome.feature_ai_desc"),
+    },
+    {
+      icon: "☁️",
+      title: t("welcome.feature_cloud_title"),
+      description: t("welcome.feature_cloud_desc"),
+    },
+  ];
+
   return (
     <SafeAreaView style={styles.safe}>
       <ScrollView
@@ -54,16 +59,13 @@ export default function WelcomeScreen() {
             />
           </View>
           <Text style={styles.appName}>DocuElevate</Text>
-          <Text style={styles.tagline}>Intelligent Document Processing</Text>
-          <Text style={styles.heroDescription}>
-            Ingest documents, run OCR, extract metadata with AI, and route files
-            to your cloud storage — all in one seamless pipeline.
-          </Text>
+          <Text style={styles.tagline}>{t("welcome.tagline")}</Text>
+          <Text style={styles.heroDescription}>{t("welcome.description")}</Text>
         </View>
 
         {/* Feature highlights */}
         <View style={styles.features}>
-          {FEATURES.map((feature) => (
+          {features.map((feature) => (
             <View key={feature.title} style={styles.featureRow}>
               <Text style={styles.featureIcon} aria-hidden={true}>{feature.icon}</Text>
               <View style={styles.featureText}>
@@ -79,14 +81,42 @@ export default function WelcomeScreen() {
           style={({ pressed }) => [styles.button, pressed && styles.buttonPressed]}
           onPress={() => router.push("/(auth)/login")}
           accessibilityRole="button"
-          accessibilityLabel="Get started — connect to your DocuElevate server"
+          accessibilityLabel={t("welcome.get_started")}
         >
-          <Text style={styles.buttonText}>Get Started</Text>
+          <Text style={styles.buttonText}>{t("welcome.get_started")}</Text>
         </Pressable>
 
-        <Text style={styles.hint}>
-          Connect to your self-hosted or cloud DocuElevate server.
-        </Text>
+        <Text style={styles.hint}>{t("welcome.hint")}</Text>
+
+        {/* Legal links – accessible pre-login for GDPR / Apple compliance */}
+        <View style={styles.legalLinks}>
+          <Pressable
+            onPress={() => Linking.openURL("https://app.docuelevate.org/privacy")}
+            accessibilityRole="link"
+            accessibilityLabel={t("legal.privacy_policy")}
+            style={styles.legalLinkButton}
+          >
+            <Text style={styles.legalLinkText}>{t("legal.privacy_policy")}</Text>
+          </Pressable>
+          <Text style={styles.legalSeparator}>·</Text>
+          <Pressable
+            onPress={() => Linking.openURL("https://app.docuelevate.org/terms")}
+            accessibilityRole="link"
+            accessibilityLabel={t("legal.terms")}
+            style={styles.legalLinkButton}
+          >
+            <Text style={styles.legalLinkText}>{t("legal.terms")}</Text>
+          </Pressable>
+          <Text style={styles.legalSeparator}>·</Text>
+          <Pressable
+            onPress={() => Linking.openURL("https://app.docuelevate.org/imprint")}
+            accessibilityRole="link"
+            accessibilityLabel={t("legal.imprint")}
+            style={styles.legalLinkButton}
+          >
+            <Text style={styles.legalLinkText}>{t("legal.imprint")}</Text>
+          </Pressable>
+        </View>
       </ScrollView>
     </SafeAreaView>
   );
@@ -206,4 +236,26 @@ const styles = StyleSheet.create({
     color: "rgba(255,255,255,0.55)",
     textAlign: "center",
   },
+  legalLinks: {
+    flexDirection: "row",
+    justifyContent: "center",
+    alignItems: "center",
+    marginTop: 20,
+    flexWrap: "wrap",
+  },
+  legalLinkButton: {
+    minHeight: 44,
+    justifyContent: "center",
+    paddingHorizontal: 4,
+  },
+  legalLinkText: {
+    fontSize: 12,
+    color: "rgba(255,255,255,0.65)",
+    textDecorationLine: "underline",
+  },
+  legalSeparator: {
+    fontSize: 12,
+    color: "rgba(255,255,255,0.45)",
+    marginHorizontal: 4,
+  },
 });