feat: Add Deployment ID setting in Profile

- Add deploymentId storage methods in api.ts (set/get/clear)
- Add Settings section in Profile with Deployment ID menu item
- Add modal dialog to edit deployment ID
- Update chat.tsx to use custom deployment ID from settings
- Priority: custom > currentBeneficiary > first beneficiary > fallback

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

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

app/(tabs)/chat.tsx

@@ -433,6 +433,18 @@ export default function ChatScreen() {
   const [beneficiaries, setBeneficiaries] = useState<Beneficiary[]>([]);
   const [loadingBeneficiaries, setLoadingBeneficiaries] = useState(false);
 
+  // Custom deployment ID from settings
+  const [customDeploymentId, setCustomDeploymentId] = useState<string | null>(null);
+
+  // Load custom deployment ID from settings
+  useEffect(() => {
+    const loadCustomDeploymentId = async () => {
+      const saved = await api.getDeploymentId();
+      setCustomDeploymentId(saved);
+    };
+    loadCustomDeploymentId();
+  }, []);
+
   // Load beneficiaries
   const loadBeneficiaries = useCallback(async () => {
     setLoadingBeneficiaries(true);
@@ -500,8 +512,9 @@ export default function ChatScreen() {
 
     try {
       // Build beneficiary data for the agent
+      // Priority: customDeploymentId from settings > currentBeneficiary > first beneficiary > fallback
       const beneficiaryData: BeneficiaryData = {
-        deploymentId: currentBeneficiary?.id?.toString() || beneficiaries[0]?.id?.toString() || '21',
+        deploymentId: customDeploymentId || currentBeneficiary?.id?.toString() || beneficiaries[0]?.id?.toString() || '21',
         beneficiaryNamesDict: {},
       };
 
@@ -539,7 +552,7 @@ export default function ChatScreen() {
     } finally {
       setIsConnectingVoice(false);
     }
-  }, [isConnectingVoice, isCallActive, currentBeneficiary, beneficiaries, user, clearTranscript, startCall]);
+  }, [isConnectingVoice, isCallActive, currentBeneficiary, beneficiaries, user, clearTranscript, startCall, customDeploymentId]);
 
   // End voice call
   const endVoiceCall = useCallback(() => {
@@ -647,8 +660,8 @@ export default function ChatScreen() {
         beneficiaryNamesDict[b.id.toString()] = b.name;
       });
 
-      // Get deployment_id from current beneficiary or fallback to first one
-      const deploymentId = currentBeneficiary?.id?.toString() || beneficiaries[0]?.id?.toString() || '21';
+      // Get deployment_id: custom from settings > current beneficiary > first beneficiary > fallback
+      const deploymentId = customDeploymentId || currentBeneficiary?.id?.toString() || beneficiaries[0]?.id?.toString() || '21';
 
       // Call API with EXACT same params as voice agent
       // SINGLE_DEPLOYMENT_MODE: sends only deployment_id (no beneficiary_names_dict)
@@ -701,7 +714,7 @@ export default function ChatScreen() {
     } finally {
       setIsSending(false);
     }
-  }, [input, isSending, getWellNuoToken]);
+  }, [input, isSending, getWellNuoToken, customDeploymentId, currentBeneficiary, beneficiaries]);
 
   // Render message bubble
   const renderMessage = ({ item }: { item: Message }) => {

app/(tabs)/profile.tsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { useState, useEffect, useCallback } from 'react';
 import {
   View,
   Text,
@@ -6,11 +6,14 @@ import {
   ScrollView,
   TouchableOpacity,
   Alert,
+  TextInput,
+  Modal,
 } from 'react-native';
 import { router } from 'expo-router';
 import { Ionicons } from '@expo/vector-icons';
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useAuth } from '@/contexts/AuthContext';
+import { api } from '@/services/api';
 import { AppColors, BorderRadius, FontSizes, Spacing } from '@/constants/theme';
 
 interface MenuItemProps {
@@ -50,6 +53,37 @@ function MenuItem({
 
 export default function ProfileScreen() {
   const { user, logout } = useAuth();
+  const [deploymentId, setDeploymentId] = useState<string>('');
+  const [showDeploymentModal, setShowDeploymentModal] = useState(false);
+  const [tempDeploymentId, setTempDeploymentId] = useState('');
+
+  // Load saved deployment ID
+  useEffect(() => {
+    const loadDeploymentId = async () => {
+      const saved = await api.getDeploymentId();
+      if (saved) {
+        setDeploymentId(saved);
+      }
+    };
+    loadDeploymentId();
+  }, []);
+
+  const openDeploymentModal = useCallback(() => {
+    setTempDeploymentId(deploymentId);
+    setShowDeploymentModal(true);
+  }, [deploymentId]);
+
+  const saveDeploymentId = useCallback(async () => {
+    const trimmed = tempDeploymentId.trim();
+    if (trimmed) {
+      await api.setDeploymentId(trimmed);
+      setDeploymentId(trimmed);
+    } else {
+      await api.clearDeploymentId();
+      setDeploymentId('');
+    }
+    setShowDeploymentModal(false);
+  }, [tempDeploymentId]);
 
   const openTerms = () => {
     router.push('/terms');
@@ -98,6 +132,19 @@ export default function ProfileScreen() {
           </View>
         </View>
 
+        {/* Settings */}
+        <View style={styles.section}>
+          <Text style={styles.sectionTitle}>Settings</Text>
+          <View style={styles.menuCard}>
+            <MenuItem
+              icon="server-outline"
+              title="Deployment ID"
+              subtitle={deploymentId || 'Not set (auto)'}
+              onPress={openDeploymentModal}
+            />
+          </View>
+        </View>
+
         {/* Legal - Required for App Store */}
         <View style={styles.section}>
           <Text style={styles.sectionTitle}>Legal</Text>
@@ -127,6 +174,46 @@ export default function ProfileScreen() {
         {/* Version */}
         <Text style={styles.version}>WellNuo v1.0.0</Text>
       </ScrollView>
+
+      {/* Deployment ID Modal */}
+      <Modal
+        visible={showDeploymentModal}
+        transparent
+        animationType="fade"
+        onRequestClose={() => setShowDeploymentModal(false)}
+      >
+        <View style={styles.modalOverlay}>
+          <View style={styles.modalContent}>
+            <Text style={styles.modalTitle}>Deployment ID</Text>
+            <Text style={styles.modalDescription}>
+              Enter the deployment ID to connect to a specific device. Leave empty for automatic detection.
+            </Text>
+            <TextInput
+              style={styles.modalInput}
+              placeholder="e.g., 21"
+              placeholderTextColor={AppColors.textMuted}
+              value={tempDeploymentId}
+              onChangeText={setTempDeploymentId}
+              keyboardType="numeric"
+              autoFocus
+            />
+            <View style={styles.modalButtons}>
+              <TouchableOpacity
+                style={styles.modalButtonCancel}
+                onPress={() => setShowDeploymentModal(false)}
+              >
+                <Text style={styles.modalButtonCancelText}>Cancel</Text>
+              </TouchableOpacity>
+              <TouchableOpacity
+                style={styles.modalButtonSave}
+                onPress={saveDeploymentId}
+              >
+                <Text style={styles.modalButtonSaveText}>Save</Text>
+              </TouchableOpacity>
+            </View>
+          </View>
+        </View>
+      </Modal>
     </SafeAreaView>
   );
 }
@@ -252,4 +339,65 @@ const styles = StyleSheet.create({
     color: AppColors.textMuted,
     paddingVertical: Spacing.xl,
   },
+  // Modal styles
+  modalOverlay: {
+    flex: 1,
+    backgroundColor: 'rgba(0, 0, 0, 0.5)',
+    justifyContent: 'center',
+    alignItems: 'center',
+    padding: Spacing.lg,
+  },
+  modalContent: {
+    backgroundColor: AppColors.background,
+    borderRadius: BorderRadius.lg,
+    padding: Spacing.lg,
+    width: '100%',
+    maxWidth: 400,
+  },
+  modalTitle: {
+    fontSize: FontSizes.lg,
+    fontWeight: '600',
+    color: AppColors.textPrimary,
+    marginBottom: Spacing.sm,
+  },
+  modalDescription: {
+    fontSize: FontSizes.sm,
+    color: AppColors.textSecondary,
+    marginBottom: Spacing.md,
+  },
+  modalInput: {
+    backgroundColor: AppColors.surface,
+    borderRadius: BorderRadius.md,
+    paddingHorizontal: Spacing.md,
+    paddingVertical: Spacing.sm + 4,
+    fontSize: FontSizes.base,
+    color: AppColors.textPrimary,
+    borderWidth: 1,
+    borderColor: AppColors.border,
+    marginBottom: Spacing.md,
+  },
+  modalButtons: {
+    flexDirection: 'row',
+    justifyContent: 'flex-end',
+    gap: Spacing.sm,
+  },
+  modalButtonCancel: {
+    paddingHorizontal: Spacing.md,
+    paddingVertical: Spacing.sm,
+  },
+  modalButtonCancelText: {
+    fontSize: FontSizes.base,
+    color: AppColors.textSecondary,
+  },
+  modalButtonSave: {
+    backgroundColor: AppColors.primary,
+    paddingHorizontal: Spacing.lg,
+    paddingVertical: Spacing.sm,
+    borderRadius: BorderRadius.md,
+  },
+  modalButtonSaveText: {
+    fontSize: FontSizes.base,
+    fontWeight: '600',
+    color: AppColors.white,
+  },
 });

services/api.ts

@@ -198,6 +198,23 @@ class ApiService {
     }
   }
 
+  // Deployment ID management
+  async setDeploymentId(deploymentId: string): Promise<void> {
+    await SecureStore.setItemAsync('deploymentId', deploymentId);
+  }
+
+  async getDeploymentId(): Promise<string | null> {
+    try {
+      return await SecureStore.getItemAsync('deploymentId');
+    } catch {
+      return null;
+    }
+  }
+
+  async clearDeploymentId(): Promise<void> {
+    await SecureStore.deleteItemAsync('deploymentId');
+  }
+
   // Beneficiaries (elderly people being monitored)
   async getBeneficiaries(): Promise<ApiResponse<{ beneficiaries: Beneficiary[] }>> {
     const token = await this.getToken();