The real regression behind "parallel tool calls don't show / tool cards get
overwritten, leaving a thin stripe with a coloured pixel on the left": the
.conv-* convergence put an `overflow:hidden` card (.conv-batch) into the
interactive pane's SCROLLING flex-column message list
(.pane--embedded .pane-messages, overflow-y:auto). An overflow:hidden flex
item's `min-height:auto` resolves to 0, so flexbox squished the tool batch to
~2px (just its left border) once the column filled — while plain .msg blocks
(overflow visible) kept their height. That asymmetry is why the COORDINATOR
(different container) and main's old `.ts-approval` block (a .msg, overflow
visible) were never hit, and why it impacted ALL models — it was never a
local-model id-collision (that earlier theory + fix were reverted).
Fix: pin every message child to flex-shrink:0 so the column scrolls instead of
collapsing cards. Reproduced + verified in the real console shell (headless):
the parallel-bash tool batch went from 2px (collapsed) to 244px (full content)
once a multi-turn conversation fills the column. Guarded in test_conversation_css.
Author shared_static/conversation.css: ONE neutral `.conv-*` approval-card
vocabulary that both panes will emit, converging the two forked cards
(coordinator's `.coord-tool-*` + interactive's `.ts-approval-*`/`.verdict-*`).
Based on the BRIEFING-blessed `.coord-tool-batch` idiom — neutral surface,
state left-stripe (warn pending / ok approved / err denied), uppercase kicker,
Approve = subtle --ok fill / Approve all = dashed --ok ghost / Deny = --err
(the DS hard-rule: approve uses --ok, never --warn) — with the interactive
affordances folded in (bash `$ cmd`, unified-diff preview, inline feedback,
recommended-button glow, auto-approved tag, the expandable verdict detail).
Converges onto the DS token vocabulary (--ok/--warn/--err, --ink-*, --panel*,
--hair*), not chat.css's legacy --green/--red/--cyan. Self-contained spinner
keyframe (conv-spin) so the sheet doesn't depend on coord-chrome.css's ts-spin,
which the standalone interactive pane never loads.
Additive only — no emitter uses `.conv-*` yet (the re-vocabularize + delete of
the old sheets is 5e.2c). Linked from the console + both standalone pages so
the card is styled the moment 5e.2c switches the emitters over.
Designer-reviewed (rendered both themes): applied the warning-chip wrap fix,
the medium-severity-weight fix (12% mix, not raw --warn-tint), ink-4 -> ink-3
on verdict-detail/tier content for light-mode AA, the bold severity label, and
the neutral judging-row stripe. Guard: tests/test_conversation_css.py (5).
Patrick Buckley