fix: remote key-up on triggered release

[jonstelly]

Fixes #369. Issue was that on using a hotkey to trigger remote release (need to do this on a wayland lock screen to return cursor/focus to my main computer), I bound release to Meta+z and the Meta key would be left down/stuck on the remote machine.

Steps to repro:

1. set release_bind in config using some modifier (meta+z is what I used)
2. attempt to release focus from a remote computer with this binding
3. modifier key ends up stuck/down

NOTE: I'm an old developer but pretty new to rust. This is a pretty small PR but if there's anything you'd like changed, just let me know

[Copilot]

Pull request overview

This PR fixes a bug where modifier keys (specifically the Meta key) would remain stuck on the remote machine after using a hotkey to trigger a remote release. The issue occurred when using a release bind like Meta+z to return focus from a locked Wayland screen.

Changes:

• Modified release_capture() to send a Leave event to the active client before releasing capture, ensuring stuck keys are cleared

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