Bug: Ctrl+C causes terminal UI rendering overlap on Windows Terminal (v1.1.16) #8159

Bug Description
Ctrl+C causes terminal UI rendering overlap on Windows Terminal. The terminal command prompt and OpenCode UI are interleaved, making it impossible to use the application properly.
Screenshots

Environment

• OpenCode Version: 1.1.16
• Operating System: Windows 11 25H2
• Terminal: Windows Terminal
• Windows Terminal Version: 7.5.4
  Steps to Reproduce

1. Open OpenCode in Windows Terminal
2. Type some input in the prompt
3. Press Ctrl+C to cancel the input
4. Observe the UI rendering overlap
   Expected Behavior
   When pressing Ctrl+C with input in the prompt, the application should either:

• Cancel the input and return to a clean prompt state, OR
• Exit the application gracefully
  Actual Behavior
• The terminal command prompt and OpenCode UI overlap
• The application becomes difficult to use
• The state is not properly reset
  Additional Context
  This issue is similar to bug: ctrl+c exiting app even when prompt input isn't empty #5071 which was closed with PR fix: ensure installation commands are using .quiet #5758, but the fix appears to be incomplete for this rendering overlap issue.
  The problem occurs every time Ctrl+C is pressed with input in the prompt.