refactor: remove crash reporter from _layout.tsx

CrashBoundary and ErrorUtils debug handler were temporary scaffolding
to identify the launch crash (react version mismatch). Removing now
that the root cause is fixed.

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

app/_layout.tsx

@@ -1,55 +1,13 @@
-import { useEffect, useState, Component } from "react";
-import type { ReactNode } from "react";
+import { useEffect } from "react";
 import { Stack, router } from "expo-router";
 import { StatusBar } from "expo-status-bar";
 import { GestureHandlerRootView } from "react-native-gesture-handler";
-import { View, Text, ScrollView } from "react-native";
 import "../global.css";
 import { Colors } from "@/constants/theme";
 import { useSettings } from "@/hooks/useSettings";
 
-// Catch JS errors in release mode and show them on-screen instead of
-// silently crashing to desktop. Remove once the crash is identified.
-class CrashBoundary extends Component<
-  { children: ReactNode },
-  { error: Error | null }
-> {
-  state = { error: null };
-  static getDerivedStateFromError(e: Error) {
-    return { error: e };
-  }
-  render() {
-    const { error } = this.state;
-    if (error) {
-      return (
-        <View style={{ flex: 1, backgroundColor: "#0f1117", padding: 20, paddingTop: 60 }}>
-          <Text style={{ color: "#ef4444", fontSize: 16, fontWeight: "700", marginBottom: 12 }}>
-            CRASH — copie ce texte
-          </Text>
-          <ScrollView>
-            <Text style={{ color: "#fff", fontSize: 11, fontFamily: "monospace" }}>
-              {String(error)}{"\n\n"}{(error as any).stack}
-            </Text>
-          </ScrollView>
-        </View>
-      );
-    }
-    return this.props.children;
-  }
-}
-
 export default function RootLayout() {
   const { settings, ready } = useSettings();
-  const [jsError, setJsError] = useState<string | null>(null);
-
-  useEffect(() => {
-    const prev = (ErrorUtils as any).getGlobalHandler();
-    (ErrorUtils as any).setGlobalHandler((e: Error, isFatal: boolean) => {
-      if (isFatal) setJsError(`${String(e)}\n\n${(e as any).stack ?? ""}`);
-      prev?.(e, isFatal);
-    });
-    return () => (ErrorUtils as any).setGlobalHandler(prev);
-  }, []);
 
   useEffect(() => {
     if (!ready) return;
@@ -58,23 +16,7 @@ export default function RootLayout() {
     }
   }, [ready, settings.onboardingDone]);
 
-  if (jsError) {
   return (
-      <View style={{ flex: 1, backgroundColor: "#0f1117", padding: 20, paddingTop: 60 }}>
-        <Text style={{ color: "#ef4444", fontSize: 16, fontWeight: "700", marginBottom: 12 }}>
-          FATAL JS ERROR — copie ce texte
-        </Text>
-        <ScrollView>
-          <Text style={{ color: "#fff", fontSize: 11, fontFamily: "monospace" }}>
-            {jsError}
-          </Text>
-        </ScrollView>
-      </View>
-    );
-  }
-
-  return (
-    <CrashBoundary>
     <GestureHandlerRootView style={{ flex: 1, backgroundColor: Colors.bg }}>
       <StatusBar style="light" />
       <Stack
@@ -93,6 +35,5 @@ export default function RootLayout() {
         <Stack.Screen name="onboarding" options={{ headerShown: false }} />
       </Stack>
     </GestureHandlerRootView>
-    </CrashBoundary>
   );
 }