fix: add mic to service field, refresh list on screen focus

new.tsx: service field was missing its mic button — VoiceField type
excluded "service" and the label used a plain Text instead of labelRow().

index.tsx: incident list only loaded on mount; router.back() does not
remount the screen so new incidents never appeared. useFocusEffect
replaces the one-shot useEffect so the list reloads on every focus.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/index.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
 import {
   View,
   Text,
@@ -6,7 +6,7 @@ import {
   Pressable,
   ActivityIndicator,
 } from "react-native";
-import { router } from "expo-router";
+import { router, useFocusEffect } from "expo-router";
 import { getIncidents } from "@/lib/db";
 import { useSettings } from "@/hooks/useSettings";
 import type { Incident } from "@/types/incident";
@@ -26,9 +26,11 @@ export default function HomeScreen() {
     }
   }, [ready, settings.homeView]);
 
-  useEffect(() => {
-    loadIncidents();
-  }, []);
+  useFocusEffect(
+    useCallback(() => {
+      loadIncidents();
+    }, [])
+  );
 
   async function loadIncidents() {
     setLoading(true);