fix: title increment based on DB max, not stored template only

After each incident save, query existing titles with the same prefix
to find the real max number, then use max(dbMax, tplNum) + 1.
Prevents duplicate counters when incidents were created before the
template was configured.

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

app/new.tsx

@@ -16,6 +16,7 @@ import {
   updateIncident,
   getIncidentById,
   getDistinctServices,
+  getMaxTitleNumber,
 } from "@/lib/db";
 import { Colors } from "@/constants/theme";
 import { useVoice } from "@/hooks/useVoice";
@@ -50,13 +51,6 @@ const LABEL_STYLE = {
 
 type VoiceField = "title" | "service" | "symptom" | "rootCause" | "fix";
 
-function incrementTemplate(template: string): string {
-  const match = template.match(/^([\s\S]*?)(\d+)$/);
-  if (!match) return template;
-  const [, prefix, numStr] = match;
-  const next = (parseInt(numStr, 10) + 1).toString().padStart(numStr.length, "0");
-  return prefix + next;
-}
 
 export default function NewIncidentScreen() {
   const { editId } = useLocalSearchParams<{ editId?: string }>();
@@ -180,7 +174,14 @@ export default function NewIncidentScreen() {
         await createIncident(form);
         const tpl = await SecureStore.getItemAsync("pref_title_template");
         if (tpl) {
-          await SecureStore.setItemAsync("pref_title_template", incrementTemplate(tpl));
+          const match = tpl.match(/^([\s\S]*?)(\d+)$/);
+          if (match) {
+            const [, prefix, numStr] = match;
+            const dbMax = await getMaxTitleNumber(prefix);
+            const tplNum = parseInt(numStr, 10);
+            const next = (Math.max(dbMax, tplNum) + 1).toString().padStart(numStr.length, "0");
+            await SecureStore.setItemAsync("pref_title_template", prefix + next);
+          }
         }
       }
       router.back();