[Feature Request] Support for custom themes, [Bug] feedback request cancels if n is typed

Bug Description
I do*'t like the built-i* themes, but I k*ow that my prefere*ces are *ot the same as a*yo*e else's, custom themes would fix this. Also, bo*us bug report, typi*g the letter after M i* the alphabet ca*cels the feedback

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.34
• Feedback ID: 4798a4c4-f56e-450a-9d29-79bcec07aa49

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/svgnet/.local/share/claude/versions/2.1.34 (expected in multi-process scenarios)\n    at nYR (/$bunfs/root/claude:3584:2098)\n    at PbA (/$bunfs/root/claude:3584:1209)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-07T03:26:51.229Z"}]

Extra note
I've wrapped the bug description copied from Claude Code in backsquiggles (`) so the code block isn't parsed further as markdown