Test: `chatUserActionRequired` accessibilty signal

[meganrogge]

Refs #248200, #244290

• Windows @cwebster-99
• macOS @jrieken
• anyOS @rzhao271

Complexity: 3

Create Issue

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We've introduced an accessibility signal, accessibility.signals.chatUserActionRequired, so that users can be notified when chat requires user action. This will play (depending on your configuration) when a tool confirmation message comes in. It is opt-in for now, pending a new, improve sound coming in June.

• Review the setting: accessibility.signals.chatUserActionRequired and its options.
• Verify that the setting applies as expected with and without screen reader mode enabled.

Note that if a confirmation takes longer than 5 seconds to come in, the sound will not play due to autoplay media restrictions - see #179349.

[rzhao271]

LGTM on Windows 11 with NVDA. I currently don't have access to a Linux VM and orca doesn't seem to work with WSL. I'll test Linux at home if I have some spare cycles.
Marking as done.