shortcut for enabling "screenreader optimized mode"

[maribethb]

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Problem

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Request

add a shortcut that when toggled on:

1. disables navigation looping
2. enables the nesting audio cues

and when toggled off does the opposite

see https://docs.google.com/document/d/1Is3u6-4uavVAFLCnUrYfR2PS8eVgccl3qXjnKtPe7IY/edit?tab=t.0#heading=h.kwr4p1x0g24 for slightly more details

note that in core the shortcut simply enables these and announces it has done so in the aria live region. but there is no UI to accompany this

Alternatives considered

No response

Additional context

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[gonfunko]

This should be bound to command/control-option-z