macOS: key events should stop repeating when press & hold is enable

[bo2themax]

We deliberately disabled ApplePressAndHoldEnabled so that repeated key events make it through to our terminal views, just like Terminal.app. Unlike Terminal.app, when you re-enable it, the accent window shows up properly, but the key keeps repeating.

We should follow Terminal.app in this case.

Screen.Recording.2026-07-03.at.10.49.37.AM.mp4

Relevant discussions: #12515, #10669

[bo2themax]

Temporary workaround: #10669 (comment)

[bo2themax]

#12278 could be related to the same rc(I haven't checked it yet), linking it here for reference when someone is working on this