[Bug] Terminal rendering corruption on window resize with CLAUDE_CODE_NO_FLICKER=1

Bug Description
Using CLAUDE_CODE_NO_FLICKER=1, when the terminal window is resized (MacOS, Wezterm), it sometimes messes up the rendering resulting in repeated lines. Screenshot below.
Environment Info

• Platform: darwin
• Terminal: WezTerm
• Version: 2.1.104
• Feedback ID: 2afad3fa-b977-4dcf-9bb5-1f7d8db277af

Errors (note I don't think they are relevant to this bug)

[{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at cYH (/$bunfs/root/src/entrypoints/cli.js:1555:33932)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-13T04:49:37.396Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at cYH (/$bunfs/root/src/entrypoints/cli.js:1555:33932)\n    at async W (/$bunfs/root/src/entrypoints/cli.js:6003:10596)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-13T04:49:37.874Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at cYH (/$bunfs/root/src/entrypoints/cli.js:1555:33932)\n    at async Z (/$bunfs/root/src/entrypoints/cli.js:6003:11366)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-13T04:49:37.875Z"}]

<img width="1287" height="987" alt="Image" src="https://github.com/user-attachments/assets/8f120491-4ead-4cf1-bd30-36478a23207f" />