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Add Keyboard Shortcuts for Improved App Accessibility and Efficiency

Description

To enhance user experience and improve interaction speed, the application should support keyboard shortcuts for frequently used actions.

Currently, most interactions rely on mouse input, which can slow down workflows, especially for power users or during continuous usage scenarios (e.g., transcription, push-to-talk, or navigation between features).

This issue focuses on introducing a consistent and intuitive set of keyboard shortcuts across the application to enable faster and more accessible control.

Scope

  • Identify key user actions that can benefit from shortcuts (e.g., start/stop recording, push-to-talk, toggle diarization, submit input, navigate UI sections)
  • Define a standardized shortcut scheme (avoiding conflicts with browser/system shortcuts)
  • Implement global and context-specific shortcuts
  • Ensure shortcuts work reliably across supported browsers and platforms
  • Provide visual hints/tooltips in the UI for discoverability

Expected Behavior

  • Users can perform core actions using keyboard shortcuts without relying on mouse interaction
  • Shortcuts respond instantly and consistently
  • No interference with default browser/system shortcuts
  • Clear indication of available shortcuts within the UI

Additional Considerations

  • Allow customization of shortcuts (future enhancement)
  • Ensure accessibility compliance (e.g., screen reader compatibility)
  • Handle focus states correctly to prevent unintended actions

Acceptance Criteria

  • Core actions are mapped to keyboard shortcuts
  • Shortcuts work across all major browsers
  • No conflicts with existing system/browser shortcuts
  • UI displays shortcut hints where applicable
  • Proper testing for edge cases (focus, input fields, modals)