Fix Codex auth import and reset credit details

# Conflicts:
#	app/(tabs)/codex.tsx
#	app/(tabs)/index.tsx
#	app/(tabs)/settings.tsx
#	hooks/useCodexUsage.ts
#	lib/api/codexApi.ts
#	package-lock.json
#	package.json

lib/fileReader.ts

@@ -1,6 +1,41 @@
 import * as DocumentPicker from "expo-document-picker";
+import * as LegacyFileSystem from "expo-file-system/legacy";
 import type { CodexAuth } from "@/types/codex";
 
+function sanitizeFileName(name: string): string {
+  return name.replace(/[^a-zA-Z0-9._-]/g, "_");
+}
+
+async function readPickedTextFile(uri: string, fileName?: string): Promise<string> {
+  try {
+    const response = await fetch(uri);
+    if (!response.ok) {
+      throw new Error(`HTTP_ERROR_${response.status}`);
+    }
+    return await response.text();
+  } catch {
+    try {
+      return await LegacyFileSystem.readAsStringAsync(uri);
+    } catch {
+      const cacheDirectory = LegacyFileSystem.cacheDirectory;
+      if (!cacheDirectory) {
+        throw new Error("DOCUMENT_NOT_READABLE");
+      }
+
+      const destination = `${cacheDirectory}${Date.now()}-${sanitizeFileName(
+        fileName ?? "import.json"
+      )}`;
+
+      try {
+        await LegacyFileSystem.copyAsync({ from: uri, to: destination });
+        return await LegacyFileSystem.readAsStringAsync(destination);
+      } catch {
+        throw new Error("DOCUMENT_NOT_READABLE");
+      }
+    }
+  }
+}
+
 export async function pickAndReadCodexAuth(): Promise<CodexAuth> {
   const result = await DocumentPicker.getDocumentAsync({
     type: "application/json",
@@ -9,9 +44,8 @@ export async function pickAndReadCodexAuth(): Promise<CodexAuth> {
 
   if (result.canceled) throw new Error("PICKER_CANCELLED");
 
-  const { uri } = result.assets[0];
-  const response = await fetch(uri);
-  const text = await response.text();
+  const { uri, name } = result.assets[0];
+  const text = await readPickedTextFile(uri, name);
 
   let parsed: Record<string, unknown>;
   try {
@@ -22,7 +56,11 @@ export async function pickAndReadCodexAuth(): Promise<CodexAuth> {
 
   const tokens = parsed["tokens"] as Record<string, unknown> | undefined;
   const accessToken = (tokens?.["access_token"] ?? parsed["accessToken"]) as string | undefined;
-  const accountId = (tokens?.["account_id"] ?? parsed["accountId"]) as string | undefined;
+  const accountId = (
+    tokens?.["account_id"] ??
+    parsed["accountId"] ??
+    parsed["account_id"]
+  ) as string | undefined;
 
   if (!accessToken || typeof accessToken !== "string") {
     throw new Error("MISSING_ACCESS_TOKEN");