Map Keychron Dictation Key on Mac

[paritoshshah]

Problem

The dedicated dictation key on many Keychron keyboards sends Fn + Spacebar. On recent versions of macOS, this key combination no longer activates Dictation, leaving the key non-functional for its intended purpose.

Solution

This PR adds a new mapping that correctly wires the Fn + Spacebar key combination to trigger the system's Dictation service. This ensures the dedicated hardware key works out-of-the-box as users would expect.

Testing

• Verified on macOS Sequoia 15.6.1 with Keychron K1 SE keyboard
• Confirmed the Fn + Spacebar combination now toggles Dictation on and off.

[tekezo]

Thanks!