feat: safe area fix, delete from repo, add Mistral provider

- Wrap root layout with SafeAreaProvider, use useSafeAreaInsets in all
  screens so FAB/action bar/scroll content clear Android nav bar
- Add deleteIncidentFromGit() (Gitea/GitHub/GitLab) — detail screen now
  offers Cancel / Local only / Local + Repo when incident was pushed
- Add Mistral as AI provider (OpenAI-compat, api.mistral.ai/v1,
  mistral-small-latest default)

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

app/incident/[id].tsx

@@ -8,11 +8,13 @@ import {
   Share,
 } from "react-native";
 import { useLocalSearchParams, router, useNavigation } from "expo-router";
+import { useSafeAreaInsets } from "react-native-safe-area-context";
 import * as Clipboard from "expo-clipboard";
 import * as SecureStore from "expo-secure-store";
 import { getIncidentById, updateIncident, deleteIncident, markIncidentPushed } from "@/lib/db";
 import { renderMarkdown } from "@/lib/markdown";
-import { pushIncidentToGit, loadGitConfig } from "@/lib/git";
+import { pushIncidentToGit, loadGitConfig, deleteIncidentFromGit } from "@/lib/git";
+import type { GitConfig } from "@/lib/git";
 import type { Incident } from "@/types/incident";
 import { Colors } from "@/constants/theme";
 
@@ -41,11 +43,14 @@ export default function IncidentDetailScreen() {
   const navigation = useNavigation();
   const [incident, setIncident] = useState<Incident | null>(null);
   const [pushing, setPushing] = useState(false);
+  const [gitConfig, setGitConfig] = useState<GitConfig | null>(null);
+  const insets = useSafeAreaInsets();
 
   useEffect(() => {
     if (id) {
-      getIncidentById(id).then((inc) => {
+      Promise.all([getIncidentById(id), loadGitConfig()]).then(([inc, config]) => {
         setIncident(inc);
+        setGitConfig(config);
         if (inc) {
           navigation.setOptions({ title: inc.title || "Incident" });
         }
@@ -55,21 +60,52 @@ export default function IncidentDetailScreen() {
 
   async function handleDelete() {
     if (!incident) return;
-    Alert.alert(
-      "Delete incident?",
-      "This action cannot be undone.",
-      [
-        { text: "Cancel", style: "cancel" },
-        {
-          text: "Delete",
-          style: "destructive",
-          onPress: async () => {
-            await deleteIncident(incident.id);
-            router.replace("/");
+
+    const canDeleteFromRepo = !!incident.gitPushedAt && gitConfig !== null;
+
+    const doDelete = async (deleteFromRepo: boolean) => {
+      if (deleteFromRepo && gitConfig) {
+        const result = await deleteIncidentFromGit(incident, gitConfig);
+        if (!result.success) {
+          Alert.alert("Repo deletion failed", result.error ?? "Unknown error");
+          return;
+        }
+      }
+      await deleteIncident(incident.id);
+      router.replace("/");
+    };
+
+    if (canDeleteFromRepo) {
+      Alert.alert(
+        "Delete incident?",
+        "This incident was pushed to the repository. Do you also want to delete the file from the repo?",
+        [
+          { text: "Cancel", style: "cancel" },
+          {
+            text: "Local only",
+            onPress: () => doDelete(false),
           },
-        },
-      ]
-    );
+          {
+            text: "Local + Repo",
+            style: "destructive",
+            onPress: () => doDelete(true),
+          },
+        ]
+      );
+    } else {
+      Alert.alert(
+        "Delete incident?",
+        "This action cannot be undone.",
+        [
+          { text: "Cancel", style: "cancel" },
+          {
+            text: "Delete",
+            style: "destructive",
+            onPress: () => doDelete(false),
+          },
+        ]
+      );
+    }
   }
 
   async function handleResolve() {
@@ -125,7 +161,7 @@ export default function IncidentDetailScreen() {
   return (
     <ScrollView
       style={{ flex: 1, backgroundColor: Colors.bg }}
-      contentContainerStyle={{ padding: 16, paddingBottom: 32 }}
+      contentContainerStyle={{ padding: 16, paddingBottom: 32 + insets.bottom }}
     >
       {/* Status badge */}
       <View style={{ flexDirection: "row", alignItems: "center", gap: 8, marginBottom: 4 }}>