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/settings.tsx

@@ -7,6 +7,7 @@ import {
   Switch,
   Pressable,
 } from "react-native";
+import { useSafeAreaInsets } from "react-native-safe-area-context";
 import * as SecureStore from "expo-secure-store";
 import { Colors } from "@/constants/theme";
 import { DEFAULT_TEMPLATE } from "@/lib/markdown";
@@ -213,6 +214,7 @@ function Field({
 }
 
 export default function SettingsScreen() {
+  const insets = useSafeAreaInsets();
   const [inputMode, setInputMode] = useState<"voice" | "form">("form");
   const [homeView, setHomeView] = useState<"dashboard" | "capture">("dashboard");
   const [aiEnabled, setAiEnabled] = useState(false);
@@ -315,7 +317,7 @@ export default function SettingsScreen() {
   return (
     <ScrollView
       style={{ flex: 1, backgroundColor: Colors.bg }}
-      contentContainerStyle={{ padding: 16, paddingBottom: 48 }}
+      contentContainerStyle={{ padding: 16, paddingBottom: 48 + insets.bottom }}
       keyboardShouldPersistTaps="handled"
     >
       <Text style={SECTION_TITLE}>Preferences</Text>
@@ -401,6 +403,7 @@ export default function SettingsScreen() {
             options={[
               { key: "anthropic", label: "Anthropic" },
               { key: "openai", label: "OpenAI" },
+              { key: "mistral", label: "Mistral" },
               { key: "perplexity", label: "Perplexity" },
               { key: "ollama", label: "Ollama" },
               { key: "openrouter", label: "OpenRouter" },