Restore active session live transcript

[ComputelessComputer]

Summary

• Restore the session-local live transcript accessory for active sessions using live transcription.

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Note

Low Risk
Scoped UI hook change with matching unit tests; no auth, data, or transcription pipeline changes.

Overview
Restores the session-local live transcript UI for the active session when live transcription is running, instead of leaving the bottom accessory empty.

useSessionBottomAccessory now subscribes to listener live state and, when the viewed session is the current active live capture (getLiveCaptureUiMode is "live"), returns DuringSessionAccessory, a Live ExpandToggle border handle, and bottomAccessoryState with mode: "live" and local expand/collapse state. BottomAccessoryState gains a "live" mode alongside "playback".

Tests are updated to mock the accessory components and assert the panel appears for the matching active live session; batch-only active recording still hides the accessory.

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