feat: add cancel recording hotkey (Escape by default, configurable)

[N0amG]

feat: Cancel recording hotkey (Escape by default, fully configurable)

Summary

As describe in the issue #290
Pressing a configurable key (default: Escape) during an active recording cancels it without transcribing. Outside of a recording, the key behaves normally system-wide.

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How it works

The cancel hotkey is registered as a globalShortcut only while recording is active, then immediately unregistered on stop, cancel, or unexpected disconnect. Zero system-wide footprint at rest.

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Changes

src/helpers/ipcHandlers.js

• register-cancel-hotkey — calls hotkeyManager.registerSlot("cancel", key, cb) (reuses existing slot system)
• unregister-cancel-hotkey — calls hotkeyManager.unregisterSlot("cancel")

preload.js

• Exposes registerCancelHotkey, unregisterCancelHotkey, onCancelHotkeyPressed to the renderer via the existing registerListener pattern

src/hooks/useAudioRecording.js

• performStartRecording() — registers the cancel hotkey on successful start
• performStopRecording() — unregisters it before stopping
• cancelRecording() — unregisters it before cancelling
• onStateChange — bug fix: unregisters if isRecording drops to false unexpectedly (e.g. streaming server disconnect), preventing a permanent Escape intercept

src/App.jsx

• Listens for onCancelHotkeyPressed and calls cancelRecording() (guarded by isRecording)

src/stores/settingsStore.ts

• cancelKey — persisted to localStorage, default "Escape", no IPC side-effects (key is read at recording start, not at boot)

src/hooks/useSettings.ts

• Exposes cancelKey / setCancelKey through SettingsContext

src/components/SettingsPage.tsx

• New HotkeyInput for the cancel key under Settings → Shortcuts
• Reset-to-default button shown when value differs from "Escape"

src/components/ui/HotkeyInput.tsx

• New prop skipListeningMode — when true, focusing the input does not suspend/resume the dictation hotkey (used for the cancel key input to avoid interference)
• Adds data-capturing attribute while capturing, used by SidebarModal below

src/components/ui/SidebarModal.tsx

• onEscapeKeyDown on DialogPrimitive.Content — prevents Radix from closing the modal when Escape is being captured by a HotkeyInput

src/locales/*/translation.json (10 languages)

• New keys for the cancel hotkey UI label, description, and reset tooltip

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Architecture note

The cancel key deliberately uses globalShortcut (same as the dictation key) rather than a DOM keydown listener, so it works even when OpenWhispr is in the background. It reuses the existing hotkeyManager slot system — no new infrastructure was needed.

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Testing checklist

• Escape cancels an active recording (no transcription triggered)
• Escape works normally outside of recording
• Custom cancel key can be set in Settings → Shortcuts
• Cancel key resets to Escape via the reset button
• Streaming disconnect should not leave the cancel key registered globally
• Settings modal does not close when pressing Escape inside the cancel key input when registering hotkey
• Dictation hotkey is not disrupted when focusing the cancel key input