fix(desktop): show live transcript across tabs

[ComputelessComputer]

Mount the active meeting live transcript in the main shell for non-active tabs and suppress competing per-session transcript controls.

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Note

Medium Risk
Touches live-session UI coordination across the main shell and per-tab accessories; behavior is heavily tested but wrong deferral could hide transcripts or batch UI on the wrong tab.

Overview
The desktop main area now wraps tab content in GlobalLiveTranscriptAccessory, so an active meeting’s live (or finalizing) transcript can appear at the bottom while you’re on other tabs—without unmounting the current tab. On the live session tab, the global layer stays off so the existing per-session live UI is not duplicated.

Per-session useSessionBottomAccessory defers live/post-session transcript chrome when another session owns the global live panel (batch progress on the open tab is unchanged). Shared shouldShowLiveTranscriptAccessory centralizes when live UI should show (active live mode vs finalizing, not record-only).

resolveMainSurfaceChrome replaces duplicated shell/body logic; the global footer adjusts borders for top vs sidebar timeline modes. StandardTabWrapper / session surfaces gain afterBorderFlush so live panels sit flush on the active session tab.

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