Resolve B-98 visual review deviations and B-97 atomicity finding:
- Scoped mentorView header to title/subtitle + theme toggle only (hides
date, refresh, background refresh, system management and account menus).
- Map contact avatars by stable id to the final day/night palette (52科比
and self stay blue; others use the final violet/green/orange/red/teal/
purple/yellow tones).
- Grade badges read A级/B级/C级; pinned contacts render a pin + 置顶
badge; row-side pin controls are removed (chat header keeps pinning).
- Chat header drops grade badges; subtitle shows the active contact
description/tagline.
- Assistant message column caps at 900px and centers on wide screens;
user bubble keeps its 60% cap.
- Widen the directory search field (~218px target), keep filter/sort on
the same row, and make the filter button icon-only (no chevron).
- Follow-up links drop the leading icon; no '日期 · 回答完成' meta line;
follow-up divider is 382px and left-aligned with the text column.
- Own-message meta shows time only; composer height converges to ~85px
while keeping auto-grow and the 168px cap.
- Selected contact right inset ~10px, header action radius 8px, and a
thin list scrollbar instead of the reserved gutter.
- Remove the iFinD settings switch fragment from index.html so the mentor
commit no longer carries half of the parallel iFinD work; the id
contract test now tolerates dangling references introduced only by
uncommitted working-tree edits.
- Add contract + e2e assertions for the header visibility, avatar tone
mapping, badge copy, chat subtitle, message max-width, composer height,
and follow-up area.
Co-authored-by: multica-agent <github@multica.ai>
