[Bug] Conversation rename fails with ENOENT error when saving to disk

Bug Description
I ran /resume and pressed R to rename a conversation. I was then prompted for the new name of the conversation. When clicking enter to register the changes, I got:

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason:
Error: ENOENT: no such file or directory, open 'n/a'
    at openSync (unknown)
    at <anonymous> (/$bunfs/root/claude:12:1277)
    at sW (/$bunfs/root/claude:11:8463)
    at appendFileSync (/$bunfs/root/claude:12:1200)
    at Dg_ (/$bunfs/root/claude:1049:3119)
    at pGR (/$bunfs/root/claude:1050:78)
    at pGR (/$bunfs/root/claude:1050:214)
    at <anonymous> (/$bunfs/root/claude:3795:475)
    at <anonymous> (/$bunfs/root/claude:3795:527)
    at WT (/$bunfs/root/claude:4630:7)

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.0.75
• Feedback ID: 77a2f86a-9c0f-4970-beb4-adf68fd5f39a

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/victor/.local/share/claude/versions/2.0.75 (expected in multi-process scenarios)\n    at XZR (/$bunfs/root/claude:2430:2165)\n    at bUA (/$bunfs/root/claude:2430:1885)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-28T10:47:02.423Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/victor/.local/share/claude/versions/2.0.76 (expected in multi-process scenarios)\n    at XZR (/$bunfs/root/claude:2430:2165)\n    at qEB (/$bunfs/root/claude:2428:8637)\n    at async e91 (/$bunfs/root/claude:2428:11835)\n    at async wx (/$bunfs/root/claude:2430:236)\n    at async <anonymous> (/$bunfs/root/claude:2430:14362)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-28T10:47:10.225Z"},{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/victor/.local/share/claude/versions/2.0.76 (expected in multi-process scenarios)\n    at XZR (/$bunfs/root/claude:2430:2165)\n    at qEB (/$bunfs/root/claude:2428:8637)\n    at async e91 (/$bunfs/root/claude:2428:11835)\n    at async wx (/$bunfs/root/claude:2430:236)\n    at async <anonymous> (/$bunfs/root/claude:2430:14362)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-28T10:47:57.067Z"}]