[Bug] Terminal Color Rendering Breaks on Arrow Key Navigation

Bug Description
Write a string like this: "Do something. Ultrathink." Ultrathink gets highlighted in many colors. Now step back to the previous words with the left arrow key and watch ANSI escape characters appear.

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.0.1
• Feedback ID:

Errors

[{"error":"AxiosError: Request failed with status code 403\n    at fN (file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:715:1077)\n    at Unzip.z0 (file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:716:9955)\n    at Unzip.emit (node:events:520:35)\n    at Unzip.emit (node:domain:489:12)\n    at endReadableNT (node:internal/streams/readable:1701:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n    at vQ1.request (file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:718:2088)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async UWA (file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:895:3745)","timestamp":"2025-10-02T15:31:55.172Z"},{"error":"AxiosError: Request failed with status code 403\n    at fN (file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:715:1077)\n    at Unzip.z0 (file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:716:9955)\n    at Unzip.emit (node:events:520:35)\n    at Unzip.emit (node:domain:489:12)\n    at endReadableNT (node:internal/streams/readable:1701:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n    at vQ1.request (file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:718:2088)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async CP6 (file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1924:478)\n    at async Promise.all (index 0)\n    at async file:///Users/markus/.claude/local/node_modules/@anthropic-ai/claude-code/cli.js:1910:4849","timestamp":"2025-10-02T15:32:26.871Z"}]