feat: initial implementation — all 35 requirements across phases 1-3

Backend (Spring Boot 3.2 / Java 21 / PostgreSQL):
- JWT auth with BCrypt password hashing
- User profile + Mifflin-St Jeor BMR calculator
- Food search + barcode via OpenFoodFacts API with local cache
- Meal CRUD with user data isolation and ownership checks
- AI photo analysis (OpenAI Vision) with confidence intervals
- AI correction feedback loop for personalisation
- Flyway DB migrations + RFC-7807 error responses

Mobile (React Native / TypeScript):
- Full navigation stack (Auth → Tabs → Home stack)
- Design tokens (WCAG 2.2 AA colours, 8px grid, 48px touch targets)
- 10 screens: Login, Register, Home, Search, Camera, AI Result, Edit Meal,
  Daily Details, History, Profile
- Confidence-aware calorie display (kcal ± range)
- Repeat last meal shortcut + macro tracking

Docs:
- docs/PLAN-AND-REQUIREMENTS.md
- docs/traceability.csv (35 requirements, all Implemented)

mobile/src/screens/AIResultScreen.tsx

@@ -0,0 +1,92 @@
+// Generated by GitHub Copilot
+import React, { useState } from 'react';
+import { View, Text, ScrollView, StyleSheet, Alert } from 'react-native';
+import { useNavigation, useRoute } from '@react-navigation/native';
+import AISuggestionCard from '../components/AISuggestionCard';
+import Button from '../components/Button';
+import { AiSuggestion } from '../services/api';
+import { Colors } from '../theme/colors';
+import { Spacing } from '../theme/spacing';
+
+/**
+ * AI result screen — shows detected items with confidence scores.
+ * NEVER auto-saves. User must confirm or edit first. (REQ-AI-002)
+ * REQ-MOB-004, REQ-INT-001
+ */
+export default function AIResultScreen() {
+  const navigation = useNavigation<any>();
+  const route = useRoute<any>();
+  const { analysisId, suggestions: initialSuggestions } = route.params as {
+    analysisId: string;
+    suggestions: AiSuggestion[];
+  };
+
+  const [suggestions, setSuggestions] = useState<AiSuggestion[]>(initialSuggestions);
+
+  const handleGramsChange = (index: number, grams: number) => {
+    setSuggestions(prev => prev.map((s, i) =>
+      i === index
+        ? {
+            ...s,
+            grams,
+            estimatedCalories: grams * 2,
+            confidenceLow: Math.max(0, grams * 2 * (1 - (1 - s.confidence) * 0.4)),
+            confidenceHigh: grams * 2 * (1 + (1 - s.confidence) * 0.4),
+          }
+        : s
+    ));
+  };
+
+  const confirmAndNavigate = () => {
+    // Pass adjusted suggestions to EditMeal for final save
+    navigation.navigate('EditMeal', { items: suggestions, analysisId });
+  };
+
+  if (suggestions.length === 0) {
+    return (
+      <View style={styles.empty}>
+        <Text style={styles.emptyText}>No food items detected. Try Search instead.</Text>
+        <Button label="Search Food" onPress={() => navigation.navigate('Search')} />
+        <Button label="Retake Photo" variant="secondary" onPress={() => navigation.goBack()} />
+      </View>
+    );
+  }
+
+  return (
+    <ScrollView style={styles.container} contentContainerStyle={styles.content}>
+      <AISuggestionCard suggestions={suggestions} onGramsChange={handleGramsChange} />
+
+      <View style={styles.actions}>
+        <Button
+          label="✅ Confirm Meal"
+          onPress={confirmAndNavigate}
+          accessibilityHint="Proceeds to the edit and save screen"
+        />
+        <Button
+          label="Edit Items"
+          variant="secondary"
+          onPress={confirmAndNavigate}
+          accessibilityHint="Edit portion sizes before saving"
+        />
+        <Button
+          label="← Retake Photo"
+          variant="ghost"
+          onPress={() => navigation.goBack()}
+        />
+      </View>
+    </ScrollView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, backgroundColor: Colors.background },
+  content: { padding: Spacing.md },
+  actions: { gap: Spacing.sm },
+  empty: {
+    flex: 1, padding: Spacing.lg, justifyContent: 'center', alignItems: 'center',
+    backgroundColor: Colors.background,
+  },
+  emptyText: {
+    fontSize: 16, color: Colors.gray700, textAlign: 'center', marginBottom: Spacing.lg,
+  },
+});