feat(mobile): magic-link login screen

apps/mobile/app/index.tsx

@@ -1,29 +1,105 @@
-import * as Application from 'expo-application';
-import { Link } from 'expo-router';
-import { Pressable, StyleSheet, Text, View } from 'react-native';
+import { auth } from '@chat-app/shared';
+import { Redirect } from 'expo-router';
+import { useState } from 'react';
+import {
+  ActivityIndicator,
+  Pressable,
+  StyleSheet,
+  Text,
+  TextInput,
+  View,
+} from 'react-native';
 
-// Phase 0 landing screen. Just enough to prove the app boots and routes:
-//   * Netralax brand wordmark (replaces the previous "ChatApp" string).
-//   * Runtime version from expo-application so we can spot stale builds
-//     on a TestFlight tester's device at a glance.
-//   * Placeholder nav link into (app)/chats — exercises Expo Router so a
-//     routing regression shows up here instead of mid-Phase-1.
-//
-// Phase 1 replaces this with the actual magic-link login form.
+import { useAuth } from '../lib/authContext';
+import { env } from '../lib/env';
+import { supabase } from '../lib/supabase';
+import { colors } from '../theme/colors';
+
+// Phase 1 landing — magic-link login. Signup with invite code is not
+// part of this MVP (accounts come from desktop / admin). After a
+// successful request the user sees a "Check your inbox" state until
+// they tap the email link and Expo Router routes the deep link to
+// app/auth/callback.tsx.
 export default function Landing() {
-  const version = Application.nativeApplicationVersion ?? '0.0.0';
+  const { session, loading } = useAuth();
+  const [email, setEmail] = useState('');
+  const [submitting, setSubmitting] = useState(false);
+  const [sent, setSent] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  if (loading) return null;
+  if (session) return <Redirect href="/(app)/chats" />;
+
+  async function handleSubmit() {
+    if (!email.includes('@')) {
+      setError('Bitte gültige E-Mail eingeben');
+      return;
+    }
+    setSubmitting(true);
+    setError(null);
+    try {
+      await auth.loginWithMagicLink(supabase, email.trim(), env.authRedirectUrl);
+      setSent(true);
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : 'Login fehlgeschlagen');
+    } finally {
+      setSubmitting(false);
+    }
+  }
+
+  if (sent) {
+    return (
+      <View style={styles.container}>
+        <Text style={styles.title}>Netralax</Text>
+        <Text style={styles.subtitle}>Check deine Mails</Text>
+        <Text style={styles.help}>
+          Wir haben dir einen Anmelde-Link an {email} geschickt. Tipp auf den Link, um
+          dich anzumelden.
+        </Text>
+        <Pressable
+          style={[styles.button, styles.buttonGhost]}
+          onPress={() => {
+            setSent(false);
+            setEmail('');
+          }}
+        >
+          <Text style={styles.buttonText}>Andere E-Mail verwenden</Text>
+        </Pressable>
+      </View>
+    );
+  }
 
   return (
     <View style={styles.container}>
       <Text style={styles.title}>Netralax</Text>
-      <Text style={styles.subtitle}>Phase 0 — Deployment-Fundament</Text>
-      <Text style={styles.version}>v{version}</Text>
+      <Text style={styles.subtitle}>Mit Magic-Link anmelden</Text>
 
-      <Link href="/(app)/chats" asChild>
-        <Pressable style={styles.button}>
-          <Text style={styles.buttonText}>Weiter (Smoke-Test)</Text>
-        </Pressable>
-      </Link>
+      <TextInput
+        value={email}
+        onChangeText={setEmail}
+        placeholder="du@beispiel.de"
+        placeholderTextColor={colors.textDim}
+        autoCapitalize="none"
+        autoCorrect={false}
+        keyboardType="email-address"
+        textContentType="emailAddress"
+        style={styles.input}
+        editable={!submitting}
+      />
+
+      {error && <Text style={styles.error}>{error}</Text>}
+
+      <Pressable
+        style={[styles.button, submitting && styles.buttonDisabled]}
+        onPress={handleSubmit}
+        disabled={submitting}
+      >
+        {submitting ? (
+          <ActivityIndicator color={colors.text} />
+        ) : (
+          <Text style={styles.buttonText}>Magic Link senden</Text>
+        )}
+      </Pressable>
     </View>
   );
 }
@@ -33,17 +109,43 @@ const styles = StyleSheet.create({
     flex: 1,
     alignItems: 'center',
     justifyContent: 'center',
-    backgroundColor: '#0b0b0f',
+    backgroundColor: colors.bg,
     padding: 24,
   },
-  title: { color: '#fff', fontSize: 32, fontWeight: '700', letterSpacing: 1 },
-  subtitle: { color: '#9ca3af', marginTop: 8, marginBottom: 4 },
-  version: { color: '#6b7280', fontSize: 12, marginBottom: 32 },
+  title: { color: colors.text, fontSize: 32, fontWeight: '700', letterSpacing: 1, marginBottom: 8 },
+  subtitle: { color: colors.textMuted, fontSize: 14, marginBottom: 24 },
+  help: {
+    color: colors.textMuted,
+    fontSize: 14,
+    textAlign: 'center',
+    marginHorizontal: 16,
+    marginBottom: 24,
+    lineHeight: 20,
+  },
+  input: {
+    width: '100%',
+    maxWidth: 360,
+    backgroundColor: colors.surface,
+    borderColor: colors.border,
+    borderWidth: 1,
+    borderRadius: 12,
+    color: colors.text,
+    paddingHorizontal: 16,
+    paddingVertical: 14,
+    fontSize: 15,
+    marginBottom: 12,
+  },
+  error: { color: colors.danger, fontSize: 13, marginBottom: 12 },
   button: {
-    backgroundColor: '#5865f2',
+    width: '100%',
+    maxWidth: 360,
+    backgroundColor: colors.accent,
     paddingHorizontal: 24,
     paddingVertical: 14,
     borderRadius: 12,
+    alignItems: 'center',
   },
-  buttonText: { color: '#fff', fontWeight: '600', fontSize: 15 },
+  buttonGhost: { backgroundColor: 'transparent', borderWidth: 1, borderColor: colors.border },
+  buttonDisabled: { opacity: 0.6 },
+  buttonText: { color: colors.text, fontWeight: '600', fontSize: 15 },
 });