feat(device-settings): Replace Location TextInput with Picker

- Replace free-text Location input with modal Picker selector
- Use ROOM_LOCATIONS constants for predefined room options
- Show icon and label for each location option
- Highlight currently selected location in picker

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/(tabs)/beneficiaries/[id]/device-settings/[deviceId].tsx

@@ -8,13 +8,15 @@ import {
   Alert,
   ActivityIndicator,
   TextInput,
+  Modal,
+  FlatList,
 } from 'react-native';
 import { Ionicons } from '@expo/vector-icons';
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { router, useLocalSearchParams } from 'expo-router';
 import * as Device from 'expo-device';
 import { useBLE } from '@/contexts/BLEContext';
-import { api } from '@/services/api';
+import { api, ROOM_LOCATIONS, type RoomLocationId } from '@/services/api';
 import type { WiFiStatus } from '@/services/ble';
 import {
   AppColors,
@@ -58,8 +60,9 @@ export default function DeviceSettingsScreen() {
   const [isSaving, setIsSaving] = useState(false);
 
   // Editable fields
-  const [location, setLocation] = useState('');
+  const [location, setLocation] = useState<RoomLocationId | ''>('');
   const [description, setDescription] = useState('');
+  const [showLocationPicker, setShowLocationPicker] = useState(false);
 
   const isConnected = connectedDevices.has(deviceId!);
 
@@ -82,13 +85,12 @@ export default function DeviceSettingsScreen() {
 
       if (sensor) {
         setSensorInfo(sensor);
-        setLocation(sensor.location || '');
+        setLocation((sensor.location as RoomLocationId) || '');
         setDescription(sensor.description || '');
       } else {
         throw new Error('Sensor not found');
       }
     } catch (error: any) {
-      console.error('[DeviceSettings] Failed to load sensor info:', error);
       Alert.alert('Error', 'Failed to load sensor information');
       router.back();
     } finally {
@@ -111,7 +113,6 @@ export default function DeviceSettingsScreen() {
       // Load WiFi status after connecting
       loadWiFiStatus();
     } catch (error: any) {
-      console.error('[DeviceSettings] Connection failed:', error);
       Alert.alert('Connection Failed', 'Failed to connect to sensor via Bluetooth.');
     } finally {
       setIsConnecting(false);
@@ -127,7 +128,6 @@ export default function DeviceSettingsScreen() {
       const wifiStatus = await getCurrentWiFi(deviceId!);
       setCurrentWiFi(wifiStatus);
     } catch (error: any) {
-      console.error('[DeviceSettings] Failed to get WiFi status:', error);
       Alert.alert('Error', 'Failed to get WiFi status');
     } finally {
       setIsLoadingWiFi(false);
@@ -173,7 +173,6 @@ export default function DeviceSettingsScreen() {
               Alert.alert('Success', 'Sensor is rebooting. It will be back online in a minute.');
               router.back();
             } catch (error: any) {
-              console.error('[DeviceSettings] Reboot failed:', error);
               Alert.alert('Error', 'Failed to reboot sensor');
             } finally{
               setIsRebooting(false);
@@ -218,7 +217,6 @@ export default function DeviceSettingsScreen() {
 
       Alert.alert('Success', 'Device information updated.');
     } catch (error: any) {
-      console.error('[DeviceSettings] Save failed:', error);
       Alert.alert('Error', error.message || 'Failed to save device information');
     } finally {
       setIsSaving(false);
@@ -353,13 +351,20 @@ export default function DeviceSettingsScreen() {
           <View style={styles.detailsCard}>
             <View style={styles.editableRow}>
               <Text style={styles.editableLabel}>Location</Text>
-              <TextInput
-                style={styles.editableInput}
-                value={location}
-                onChangeText={setLocation}
-                placeholder="e.g., Living Room, Kitchen..."
-                placeholderTextColor={AppColors.textMuted}
-              />
+              <TouchableOpacity
+                style={styles.pickerButton}
+                onPress={() => setShowLocationPicker(true)}
+              >
+                <Text style={[
+                  styles.pickerButtonText,
+                  !location && styles.pickerButtonPlaceholder
+                ]}>
+                  {location
+                    ? `${ROOM_LOCATIONS.find(l => l.id === location)?.icon} ${ROOM_LOCATIONS.find(l => l.id === location)?.label}`
+                    : 'Select location...'}
+                </Text>
+                <Ionicons name="chevron-down" size={20} color={AppColors.textMuted} />
+              </TouchableOpacity>
             </View>
             <View style={styles.detailDivider} />
             <View style={styles.editableRow}>
@@ -514,6 +519,56 @@ export default function DeviceSettingsScreen() {
           </Text>
         </View>
       </ScrollView>
+
+      {/* Location Picker Modal */}
+      <Modal
+        visible={showLocationPicker}
+        animationType="slide"
+        transparent={true}
+        onRequestClose={() => setShowLocationPicker(false)}
+      >
+        <View style={styles.modalOverlay}>
+          <View style={styles.modalContent}>
+            <View style={styles.modalHeader}>
+              <Text style={styles.modalTitle}>Select Location</Text>
+              <TouchableOpacity
+                style={styles.modalCloseButton}
+                onPress={() => setShowLocationPicker(false)}
+              >
+                <Ionicons name="close" size={24} color={AppColors.textPrimary} />
+              </TouchableOpacity>
+            </View>
+            <FlatList
+              data={ROOM_LOCATIONS}
+              keyExtractor={(item) => item.id}
+              renderItem={({ item }) => (
+                <TouchableOpacity
+                  style={[
+                    styles.locationOption,
+                    location === item.id && styles.locationOptionSelected
+                  ]}
+                  onPress={() => {
+                    setLocation(item.id);
+                    setShowLocationPicker(false);
+                  }}
+                >
+                  <Text style={styles.locationOptionIcon}>{item.icon}</Text>
+                  <Text style={[
+                    styles.locationOptionText,
+                    location === item.id && styles.locationOptionTextSelected
+                  ]}>
+                    {item.label}
+                  </Text>
+                  {location === item.id && (
+                    <Ionicons name="checkmark" size={20} color={AppColors.primary} />
+                  )}
+                </TouchableOpacity>
+              )}
+              ItemSeparatorComponent={() => <View style={styles.locationSeparator} />}
+            />
+          </View>
+        </View>
+      </Modal>
     </SafeAreaView>
   );
 }
@@ -688,6 +743,26 @@ const styles = StyleSheet.create({
     minHeight: 60,
     textAlignVertical: 'top',
   },
+  // Picker Button
+  pickerButton: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+    backgroundColor: AppColors.background,
+    borderRadius: BorderRadius.md,
+    paddingHorizontal: Spacing.md,
+    paddingVertical: Spacing.sm,
+    borderWidth: 1,
+    borderColor: AppColors.border,
+    minHeight: 44,
+  },
+  pickerButtonText: {
+    fontSize: FontSizes.base,
+    color: AppColors.textPrimary,
+  },
+  pickerButtonPlaceholder: {
+    color: AppColors.textMuted,
+  },
   saveButton: {
     flexDirection: 'row',
     alignItems: 'center',
@@ -872,4 +947,63 @@ const styles = StyleSheet.create({
     color: AppColors.info,
     lineHeight: 20,
   },
+  // Modal styles
+  modalOverlay: {
+    flex: 1,
+    backgroundColor: 'rgba(0, 0, 0, 0.5)',
+    justifyContent: 'flex-end',
+  },
+  modalContent: {
+    backgroundColor: AppColors.surface,
+    borderTopLeftRadius: BorderRadius.xl,
+    borderTopRightRadius: BorderRadius.xl,
+    maxHeight: '70%',
+    paddingBottom: Spacing.xl,
+  },
+  modalHeader: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+    paddingHorizontal: Spacing.lg,
+    paddingVertical: Spacing.md,
+    borderBottomWidth: 1,
+    borderBottomColor: AppColors.border,
+  },
+  modalTitle: {
+    fontSize: FontSizes.lg,
+    fontWeight: FontWeights.semibold,
+    color: AppColors.textPrimary,
+  },
+  modalCloseButton: {
+    padding: Spacing.xs,
+  },
+  locationOption: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    paddingHorizontal: Spacing.lg,
+    paddingVertical: Spacing.md,
+    gap: Spacing.md,
+  },
+  locationOptionSelected: {
+    backgroundColor: AppColors.primaryLighter,
+  },
+  locationOptionIcon: {
+    fontSize: 24,
+    width: 32,
+    textAlign: 'center',
+  },
+  locationOptionText: {
+    flex: 1,
+    fontSize: FontSizes.base,
+    color: AppColors.textPrimary,
+  },
+  locationOptionTextSelected: {
+    fontWeight: FontWeights.semibold,
+    color: AppColors.primary,
+  },
+  locationSeparator: {
+    height: 1,
+    backgroundColor: AppColors.border,
+    marginLeft: Spacing.lg + 32 + Spacing.md,
+  },
 });