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/new.tsx

@@ -46,7 +46,7 @@ const LABEL_STYLE = {
   letterSpacing: 0.5,
 } as const;
 
-type VoiceField = "title" | "symptom" | "rootCause" | "fix";
+type VoiceField = "title" | "service" | "symptom" | "rootCause" | "fix";
 
 export default function NewIncidentScreen() {
   const { editId } = useLocalSearchParams<{ editId?: string }>();
@@ -224,7 +224,7 @@ export default function NewIncidentScreen() {
           returnKeyType="next"
         />
 
-        <Text style={[LABEL_STYLE, { marginBottom: 6 }]}>Service</Text>
+        {labelRow("Service", "service")}
         <TextInput
           style={FIELD_STYLE}
           value={form.service}