One config key everywhere (#41531): the same display.timestamps that stamps
[HH:MM] on classic-CLI labels now gates the desktop transcript's timeline
timestamps and renders dim [HH:MM] labels on TUI user/assistant rows.
- desktop: $displayTimestamps store fed from config.yaml via
use-hermes-config; TimelineTimestamp renders nothing while the key is off
(the default). Hover tooltips with the exact time stay ungated (#70450).
- TUI: tui_gateway forwards each persisted row's timestamp in the display
projection; toTranscriptMessages threads it as Msg.createdAt; live rows
are stamped at append (the #82840 rule); MessageLine shows a dim [HH:MM]
above user/assistant rows when display.timestamps is on.
- No new config keys, no HERMES_* env vars; display-only, prompt-cache safe.
77fcc2ea31