[Bug] Incorrect File Encoding for Non-English Characters

Bug Description
When writing non-English characters to a file, they may appear garbled. Please fix this issue. For example, write the Japanese greeting "こんにちは" to '/path/test.txt'.

Environment Info

• Platform: darwin
• Terminal: cursor
• Version: 1.0.123
• Feedback ID: d444debb-a8ed-4ce3-87ca-d56fbabf6a08

Errors

[{"error":"Error: 500 {\"type\":\"error\",\"error\":{\"type\":\"api_error\",\"message\":\"Overloaded\"},\"request_id\":null}\n    at a9.generate (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:977:2654)\n    at AP.makeStatusError (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:994:2131)\n    at AP.makeRequest (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:994:5344)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n    at async XQB.ZY1.showErrors (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1919:33388)\n    at async ZY1 (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1919:21632)\n    at async XQB (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1919:33215)\n    at async file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1919:27984\n    at async fH0 (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1919:4362)\n    at async K01 (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1919:27954)","timestamp":"2025-09-24T07:44:48.500Z"},{"error":"Error: Request was aborted.\n    at AP.makeRequest (file:///Users/yw.hao/.nvm/versions/node/v20.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:994:3864)\n    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)","timestamp":"2025-09-24T07:48:20.132Z"}]