feat: KVM Auto-Refresh Support - Auto-restore lighting on device reconnect (#452)

[Kiki-bo-zhang]

Description

This PR implements automatic device refresh and lighting restoration when Razer devices reconnect via KVM switch, addressing issue #452.

Problem

When switching between Mac and PC via KVM:

• Keyboard goes dark when switching back to Mac
• User must manually click menubar icon → Refresh Device List → Select lighting

Solution

Implemented USB monitoring that automatically:

1. Detects when Razer devices connect/disconnect
2. Auto-refreshes device list on reconnection
3. Restores last used lighting settings

Features

• USBMonitor class: Monitors USB attach/detach events using node-usb
• Auto-refresh: Automatically refreshes device list when keyboard reconnects
• Lighting restoration: Applies last known lighting state after reconnection
• KVM State Setting: New "Device Reconnect" state option in settings

Changes

File	Changes
src/main/usbmonitor.js	New USB monitoring module
src/main/razerapplication.js	Integrate USBMonitor, start on init
src/main/statemanager.js	Add stateOnDeviceReconnect, applyCurrentState
package.json	Add usb dependency (v2.11.0)

Testing

1. Connect Razer keyboard to Mac
2. Switch to PC via KVM
3. Switch back to Mac
4. Keyboard should automatically:
   • Be detected
   • Have lighting restored to last used state

Technical Details

• Uses Razer vendor ID (0x1532) to filter relevant devices
• Tracks detached devices to distinguish KVM reconnections from new connections
• 1-second delay after attach event ensures device is ready
• Respects user-defined "stateOnDeviceReconnect" setting if configured

Fixes #452

@1kc Please review when you have time!

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IssueHunt Summary

Referenced issues

This pull request has been submitted to:

• #452: Support for multiple computer / KVM setup

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