feat: add configurable stop shortcut

[shaw-baobao]

Summary

• add a configurable stop shortcut in Settings (defaults to Ctrl+C)
• wire the shortcut to interrupt the active run

Testing

• npm run lint
• npm run test
• npm run typecheck

[Copilot]

Pull request overview

This PR adds a configurable keyboard shortcut for stopping active agent runs, defaulting to Ctrl+C. The implementation allows users to customize this shortcut through the Settings UI and properly wires it to the interrupt functionality.

Changes:

• Added interruptShortcut setting with "ctrl+c" as the default across TypeScript and Rust type systems
• Created useInterruptShortcut hook to handle keyboard events and trigger interruption when conditions are met
• Extended Settings UI with a new "Stop active run" shortcut configuration field in the Composer section

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/types.ts	Added interruptShortcut field to AppSettings type
src/features/settings/hooks/useAppSettings.ts	Set default value for interruptShortcut to "ctrl+c"
src/features/settings/components/SettingsView.tsx	Added UI field for configuring the interrupt shortcut with proper state management
src/features/settings/components/SettingsView.test.tsx	Updated test fixture to include interruptShortcut: null
src/features/app/hooks/useInterruptShortcut.ts	New hook that listens for keyboard events and triggers interrupt callback when shortcut matches
src/App.tsx	Integrated useInterruptShortcut hook with canInterrupt state and interruptTurn callback
src-tauri/src/types.rs	Added Rust backend support for interrupt_shortcut field with default value and serialization

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[Dimillian]

What about Linux and Windows where CTRL-C is copy?

[shaw-baobao]

What about Linux and Windows where CTRL-C is copy?

Good point.

This was mainly intended for macOS, where copy is ⌘C and Ctrl+C is commonly used to interrupt running tasks (similar to terminal behavior).

The shortcut is fully configurable in Settings, so it’s not meant to be a hard-coded cross-platform default. If/when Windows or Linux support becomes first-class, it would make sense to adjust the default per platform (or disable it by default there) while keeping the same mechanism.

Also, the shortcut only triggers when there’s an active run that can actually be interrupted, so it shouldn’t interfere with normal text input / copy in practice.