frontend-mobile/components/LoadingSpinner.tsx

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+import React from 'react';
+import { View, ActivityIndicator, Text, StyleSheet } from 'react-native';
+import { colors, spacing } from '../constants/theme';
+
+interface LoadingSpinnerProps {
+  message?: string;
+}
+
+export function LoadingSpinner({ message = 'Cargando...' }: LoadingSpinnerProps) {
+  return (
+    <View style={styles.container}>
+      <ActivityIndicator size="large" color={colors.primary} />
+      <Text style={styles.message}>{message}</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    justifyContent: 'center',
+    alignItems: 'center',
+    padding: spacing.xl,
+  },
+  message: {
+    marginTop: spacing.md,
+    fontSize: 16,
+    color: colors.textSecondary,
+  },
+});

frontend-mobile/components/MedicineCard.tsx

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+import React from 'react';
+import { View, Text, StyleSheet, TouchableOpacity } from 'react-native';
+import { useRouter } from 'expo-router';
+import { Ionicons } from '@expo/vector-icons';
+import { colors, spacing, borderRadius } from '../constants/theme';
+import { StockBadge } from './StockBadge';
+import { Medicine } from '../types';
+
+interface MedicineCardProps {
+  medicine: Medicine;
+}
+
+export function MedicineCard({ medicine }: MedicineCardProps) {
+  const router = useRouter();
+
+  const handlePress = () => {
+    router.push(`/medicine/${medicine.nregistro}`);
+  };
+
+  return (
+    <TouchableOpacity style={styles.card} onPress={handlePress} activeOpacity={0.7}>
+      <View style={styles.header}>
+        <Text style={styles.name} numberOfLines={2}>
+          {medicine.nombre}
+        </Text>
+        <StockBadge stock={medicine.stock} />
+      </View>
+      
+      <Text style={styles.principioActivo} numberOfLines={1}>
+        {medicine.principioActivo}
+      </Text>
+      
+      <View style={styles.footer}>
+        <View style={styles.priceContainer}>
+          <Ionicons name="pricetag" size={14} color={colors.textSecondary} />
+          <Text style={styles.price}>
+            {medicine.precio ? `${medicine.precio.toFixed(2)} €` : 'Sin precio'}
+          </Text>
+        </View>
+        
+        <View style={styles.labContainer}>
+          <Ionicons name="business" size={14} color={colors.textSecondary} />
+          <Text style={styles.laboratorio} numberOfLines={1}>
+            {medicine.laboratorio}
+          </Text>
+        </View>
+      </View>
+    </TouchableOpacity>
+  );
+}
+
+const styles = StyleSheet.create({
+  card: {
+    backgroundColor: colors.card,
+    borderRadius: borderRadius.md,
+    padding: spacing.md,
+    marginHorizontal: spacing.md,
+    marginVertical: spacing.xs,
+    shadowColor: '#000',
+    shadowOffset: { width: 0, height: 2 },
+    shadowOpacity: 0.1,
+    shadowRadius: 4,
+    elevation: 2,
+  },
+  header: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    alignItems: 'flex-start',
+    marginBottom: spacing.xs,
+  },
+  name: {
+    flex: 1,
+    fontSize: 16,
+    fontWeight: '600',
+    color: colors.text,
+    marginRight: spacing.sm,
+  },
+  principioActivo: {
+    fontSize: 14,
+    color: colors.textSecondary,
+    marginBottom: spacing.sm,
+  },
+  footer: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    alignItems: 'center',
+  },
+  priceContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+  },
+  price: {
+    fontSize: 14,
+    fontWeight: '600',
+    color: colors.text,
+    marginLeft: spacing.xs,
+  },
+  labContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    flex: 1,
+    justifyContent: 'flex-end',
+  },
+  laboratorio: {
+    fontSize: 12,
+    color: colors.textSecondary,
+    marginLeft: spacing.xs,
+    maxWidth: 120,
+  },
+});

frontend-mobile/components/SearchBar.tsx

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+import React, { useState } from 'react';
+import { View, TextInput, StyleSheet, TouchableOpacity } from 'react-native';
+import { Ionicons } from '@expo/vector-icons';
+import { colors, spacing, borderRadius } from '../constants/theme';
+
+interface SearchBarProps {
+  placeholder?: string;
+  onSearch: (query: string) => void;
+  value?: string;
+  onChangeText?: (text: string) => void;
+}
+
+export function SearchBar({ 
+  placeholder = 'Buscar medicamentos...', 
+  onSearch,
+  value,
+  onChangeText 
+}: SearchBarProps) {
+  const [localValue, setLocalValue] = useState(value || '');
+
+  const handleChange = (text: string) => {
+    setLocalValue(text);
+    onChangeText?.(text);
+  };
+
+  const handleSubmit = () => {
+    onSearch(localValue);
+  };
+
+  const handleClear = () => {
+    setLocalValue('');
+    onChangeText?.('');
+    onSearch('');
+  };
+
+  return (
+    <View style={styles.container}>
+      <Ionicons name="search" size={20} color={colors.textSecondary} style={styles.icon} />
+      <TextInput
+        style={styles.input}
+        placeholder={placeholder}
+        placeholderTextColor={colors.textSecondary}
+        value={localValue}
+        onChangeText={handleChange}
+        onSubmitEditing={handleSubmit}
+        returnKeyType="search"
+        autoCorrect={false}
+      />
+      {localValue.length > 0 && (
+        <TouchableOpacity onPress={handleClear} style={styles.clearButton}>
+          <Ionicons name="close-circle" size={20} color={colors.textSecondary} />
+        </TouchableOpacity>
+      )}
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    backgroundColor: colors.card,
+    borderRadius: borderRadius.md,
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.sm,
+    marginHorizontal: spacing.md,
+    marginVertical: spacing.sm,
+  },
+  icon: {
+    marginRight: spacing.sm,
+  },
+  input: {
+    flex: 1,
+    fontSize: 16,
+    color: colors.text,
+    paddingVertical: spacing.xs,
+  },
+  clearButton: {
+    marginLeft: spacing.sm,
+  },
+});

frontend-mobile/components/StockBadge.tsx

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+import React from 'react';
+import { View, Text, StyleSheet } from 'react-native';
+import { colors, borderRadius, spacing } from '../constants/theme';
+
+interface StockBadgeProps {
+  stock: number;
+}
+
+export function StockBadge({ stock }: StockBadgeProps) {
+  const getBadgeStyle = () => {
+    if (stock === 0) return styles.danger;
+    if (stock < 5) return styles.warning;
+    return styles.success;
+  };
+
+  const getText = () => {
+    if (stock === 0) return 'Sin stock';
+    if (stock < 5) return `Bajo (${stock})`;
+    return `Disponible (${stock})`;
+  };
+
+  return (
+    <View style={[styles.badge, getBadgeStyle()]}>
+      <Text style={styles.text}>{getText()}</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  badge: {
+    paddingHorizontal: spacing.sm,
+    paddingVertical: spacing.xs,
+    borderRadius: borderRadius.sm,
+  },
+  success: {
+    backgroundColor: '#D4EDDA',
+  },
+  warning: {
+    backgroundColor: '#FFF3CD',
+  },
+  danger: {
+    backgroundColor: '#F8D7DA',
+  },
+  text: {
+    fontSize: 12,
+    fontWeight: '600',
+  },
+});