fix(keybinds): remove ctrl+c from default app_exit to prevent accidental exits

[shrwnsan]

Summary

Removes Ctrl+C from the default app_exit keybind to prevent users from accidentally exiting OpenCode when trying to copy text.

Problem

Ctrl+C is the universal copy shortcut on Windows and commonly used on Linux. Users frequently press it out of habit, accidentally terminating their session and losing context/conversation history.

Changes

• Config: Changed default app_exit from "ctrl+c,ctrl+d,<leader>q" to "ctrl+d,<leader>q"
• Error Screen: Fixed hardcoded ctrl+c check in ErrorComponent to respect configurable keybinds

Testing

• ✅ All 12 packages pass typecheck
• ✅ 101 tests pass (keybind + config suites)
• ✅ Manual testing confirms:
  • Ctrl+C no longer exits (clears input or does nothing)
  • Ctrl+D exits as expected
  • User config overrides still work (backward compatible)

Migration

Users who prefer the old behavior can restore it via config:

{
"keybinds": {
"app_exit": "ctrl+c,ctrl+d,<leader>q"
}
}

Closes#7957

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found several related PRs that attempted similar solutions to the Ctrl+C exit issue:

Potentially Related PRs

1. PR feat(tui): implement double Ctrl+C to quit #9050 - feat(tui): implement double Ctrl+C to quit

   • Addresses the same problem (accidental exits with Ctrl+C) but with a different solution (double press requirement)

2. PR feat: require double Ctrl+C to exit when input is empty #6494 - feat: require double Ctrl+C to exit when input is empty

   • Another approach to the same issue, using a double-press mechanism

3. PR fix(tui): resolve keybind conflicts and missing defaults (issue #4997) #8786 - fix(tui): resolve keybind conflicts and missing defaults (issue #4997)

   • Related to keybind configuration and defaults

4. PR fix: app_exit keybind ignored when using <leader> (including default <leader>q) #8151 - fix: app_exit keybind ignored when using <leader>

   • Related to app_exit keybind functionality

These PRs (especially #9050 and #6494) represent alternative approaches to solving the accidental exit problem. Your PR (#11291) takes a different approach by simply removing Ctrl+C from the default entirely rather than requiring a double-press. Worth reviewing these to ensure consistency and no conflicting changes.

[alexanderkjeldaas]

alternative could be that ctrl+c must be pressed twice or more? or quickly.

[shrwnsan]

alternative could be that ctrl+c must be pressed twice or more? or quickly.

Could be too. Some open PRs addressing it indeed

[github-actions]

Closing this pull request because it has had no updates for more than 60 days. If you plan to continue working on it, feel free to reopen or open a new PR.