hammerspoon: launch apps after modifiers release

[mfkd]

Summary

• keep the existing Caps Lock Hyper chord as Control+Option+Command+Shift
• run app launcher actions after startup modifiers are released
• preserve app toggle behavior while preventing held modifiers from leaking into launched apps

Why

Holding the Hyper chord while launching apps can leak startup modifiers into the target app. That matters for apps like Music and Photos, where macOS documents modifier-driven startup behavior. This PR was the first attempt to stop that leakage.

Tradeoff

This approach waits for the physical modifiers to be released before launching or focusing the app, so it avoids the modifier leak but adds perceived latency. PR #5 supersedes this with an immediate approach.

Test

• luac -p .hammerspoon/init.lua

[mfkd]

Note: this implementation waits for the physical modifier keys to be released before launching/focusing apps. That avoids Shift/Option leaking into app startup, but it adds perceived latency because the app opens only after key release. I am superseding this with a separate PR based on main that launches immediately after posting synthetic modifier key-up events.