an infinite-canvas terminal multiplexer using gpui

tarp: follow the keyboard layout for option as alt #8

Open eti.tf
targeting op/kmwmtpnqoxwu from eti.tf/tarp:eti/option-as-alt-detection
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targeting op/kmwmtpnqoxwu from eti.tf/tarp:eti/option-as-alt-detection

macos_option_as_alt now defaults to the keyboard layout: opt is alt on the us layouts and composes characters on any other layout, such as eurkey. setting it to true or false still forces one or the other, and tarp reapplies it when the layout changes. based on op/kmwmtpnqoxwu.

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