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

[Zhangbo-cn]

Issue for this PR

Closes #7957

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

ctrl+c is bound to app_exit by default in the TUI, so pressing it with an empty prompt or during generation quits the whole app. That conflicts with the universal copy shortcut and has been reported in #7957 (and earlier in #2999); previous fix PRs (#11291, #9050) were auto-closed before landing.

This PR removes ctrl+c from the app_exit default in packages/tui/src/config/keybind.ts: "ctrl+c,ctrl+d,<leader>q" → "ctrl+d,<leader>q". Ctrl+D and <leader>q still exit the app. Docs (18 locales) are synced.

No tests assert the old default, so no test changes are needed.

How did you verify your code works?

• Reproduced the issue before the change: in tmux, Ctrl+C exits on both the idle home screen and mid-generation.
• With the new default, Ctrl+C no longer exits the app; Ctrl+D and <leader>q still exit.
• No unit tests cover the keybind defaults, so nothing else needed updating.

Screenshots / recordings

Keybinding default change in the TUI; no visible UI diff. Can add a terminal recording if helpful.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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