[codex] keep completed assistant copy actions visible

[maxwellyoung]

Fixes #4046

Problem

The completed assistant-message footer is hidden with opacity-0 until its row is hovered or focused. When someone selects response text and moves outside the row, the footer fades out and the copy action disappears before it can be used. The same hover dependency also makes the action undiscoverable on non-hover inputs.

Root cause

AssistantTimelineRow correctly limits copy controls to eligible completed assistant messages through the existing copy-state logic, but the containing footer adds a second presentation constraint: hover-only opacity. That constraint hides an otherwise valid action based on pointer position.

Fix

• Keep the footer for eligible completed assistant messages visible.
• Preserve the existing state logic that omits the action for streaming, empty, and non-terminal assistant messages.
• Add a regression test proving that the completed assistant copy action is rendered without hover-dependent opacity.

Validation

• pnpm --filter @t3tools/web test -- src/components/chat/MessagesTimeline.test.tsx — 151 files and 1,318 tests passed
• vp check — passes with 10 existing warnings outside this diff
• vp run typecheck
• git diff --check

Visual verification

The issue recording demonstrates the before-state: the completed-message footer disappears after the pointer leaves the assistant row.

The after-state below was captured from the full local app with the pointer moved away from the assistant row. The copy action and timestamp remain visible; the footer's computed opacity is 1.

Web/shared impact

This changes only the presentation of the completed assistant-message footer in the web/desktop chat timeline. Message state, copy behavior, streaming behavior, server communication, native mobile code, and shared contracts are unchanged.

Migration/deploy impact

None. There are no schema, migration, API, auth, session, realtime transport, or deployment configuration changes.

Post-deploy smoke check

1. Complete an assistant response.
2. Select some response text and move the pointer outside the message row.
3. Confirm the footer and copy action remain visible and usable.
4. Confirm streaming and non-terminal assistant messages still omit the copy action.

Note

Keep completed assistant message copy actions persistently visible

Previously, the assistant message footer (copy link button and timestamp) was hidden behind hover/focus opacity transitions. The footer in AssistantTimelineRow now renders with full opacity when showAssistantMeta is true, removing the opacity-0 and hover/focus classes. A data-assistant-message-footer="persistent" attribute is added to the wrapper div to reflect this behavior change.

^{Macroscope summarized 1479e5d.}

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Note

Low Risk
UI-only change in the chat timeline footer styling; copy eligibility logic is unchanged.

Overview
Completed assistant message footers (copy link and timestamp) are no longer hidden behind hover/focus opacity. The footer stays visible whenever showAssistantMeta applies, without changing when copy controls are shown for streaming or in-progress turns.

AssistantTimelineRow drops the opacity-0 / group-hover transition classes and marks the footer with data-assistant-message-footer="persistent". A regression test renders a finished assistant message and asserts the copy action is present and not tied to opacity-0.

^{Reviewed by Cursor Bugbot for commit 1479e5d. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Approved

This is a minor UI adjustment that makes assistant message copy actions always visible instead of requiring hover. The change is limited to CSS classes with proper test coverage and no runtime logic changes.

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