Why

On an active session row the sidebar showed both the pulsing orange "running" dot (left) and the relative timestamp (right, e.g. 13h) — redundant, and the operator flagged it as a bug. #133 had made the timestamp always-visible on every row in response to "show the timestamp even without hovering," but applied it globally including active rows. The original intent (Wave 1.5 / #127) was for the orange dot to be the sole status cue on active rows.

What changed

• apps/desktop/src/app/chat/sidebar/session-row.tsx: the trailing-slot timestamp is now opacity-0 while isWorking. It stays mounted (width reserved) rather than unmounted, so the 3-dot actions menu still lands in the same spot on hover and the row height never shifts. Idle rows are unchanged — timestamp visible at rest, slides left on hover/focus while the menu slides in from the right. Transition widened to [transform,opacity] so the hide is smooth if a row transitions active→idle live.

How to review

1. The single isWorking && 'opacity-0' addition on the age <span> and the updated slot comment.
2. Confirm the actions menu (absolute, right-1) is independent of the timestamp, so active rows still get pin/archive/delete on hover.

Evidence

• Active row: orange dot only, no timestamp. Idle row: timestamp at rest → slides aside for menu on hover. Row width/height identical across both states (timestamp width reserved).

Verification

• apps/desktop: tsc -b 0 errors; vitest chat/sidebar + chat-messages suites — 42 passed. Built into the packaged app and swapped onto the running install for visual confirmation.

Risks / gaps

• Pure CSS state on an existing render branch, no logic change — no known risks.
• The codex-style "animated dots while active" alternative the operator floated is intentionally not implemented here; hiding-with-dot was the chosen behavior — no work item needed (revisit only if requested).

Collaborators

• @OmarB97 (operator)
• Claude Fable 5 (Claude Code)