Four upstream tests read renderMessages out of ui.js and run a slice of it against a fake segment object. Since the message block goes in through _insertSegmentBlock, three of them stopped at "ReferenceError: _insertSegmentBlock is not defined" and the fourth still pinned the old seg.insertAdjacentHTML line, which took twelve of the fifteen test shards red on this branch and nowhere else.
test_status_command_card.py defines the helper in its own harness, one line that does what the real helper does without a browser. test_compaction_current_summary_fallback.py and test_anchor_fallback_ownership.py evaluate the real helper from ui.js alongside the functions they already evaluate; their DOM shims return no template content, so it takes its insertAdjacentHTML fallback exactly as before. test_sprint49.py pins the new call, and its point is unchanged: the footer still rides in the same block as the body.
A new case in tests/test_issue2051_duplicate_assistant_answer.py pins why the helper exists, which answers a review note: the block is parsed into a template and the nodes are MOVED, so a repeated call adds nothing, and insertAdjacentHTML survives only as the fallback. All three insertions go through it.
tests/test_anchor_fallback_ownership.py, tests/test_compaction_current_summary_fallback.py, tests/test_sprint49.py, tests/test_status_command_card.py: 34 passed. The three #2051 files: 12 passed.
Squash merge of PR #717 — rebased on behalf of @franksong2702.
## What it does
Fixes#680. Footer chrome (timestamps, copy, edit, regenerate) is now hover-only for both user and assistant message rows, consistent throughout the conversation. The last assistant turn keeps cumulative usage visible at rest; timestamp and actions are revealed inline on hover in the same row.
Key changes:
- `static/ui.js`: new `_formatMessageFooterTimestamp()` (local timezone, cross-day fuller format); `timeHtml` no longer gated to user-only; last assistant usage moved from separate `.msg-usage` div to inline `.msg-usage-inline` span in the footer
- `static/style.css`: `.msg-foot-with-usage` class + rules; assistant footer opacity changed from 0.45 to 0 (hover-only); `:focus-within` alongside `:hover` for keyboard users
- `api/streaming.py`: `_restore_reasoning_metadata()` now preserves `_ts`/`timestamp` for unchanged historical messages
- `tests/test_sprint49.py`: 8 new tests covering rendering contract, hover CSS, timestamp preservation
Tests: 1518 passed. QA: 20/20. Browser verified. Reviewed and approved by @nesquena and @aronprins.
Thireus ☠