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fix(chat): keep latest-turn actions under the reply (BUG-1042)

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The BUG-930 pin spacer sat on the last assistant row, pushing its sibling
.message-actions (and follow-ups / delivery card) below half a screen of
empty space. Move the same min-height onto the last turn's entry
(`:last-child:has(.message-assistant)`) with align-content: start so the
rectification grid wrap does not stretch its rows. Hook logic unchanged.

Records BUG-1043 / BUG-1044 (pre-existing, investigating) found during
browser verification.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8
This commit is contained in:
Jesse_Chen
2026-09-26 10:19:00 +08:00
co-authored by Claude Opus 5.5
parent ac224cef6a
commit 83cce7ad6a
13 changed files with 189 additions and 7 deletions
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frontend/DESIGN.md
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@@ -257,7 +257,7 @@ Both chat surfaces pin a new turn at its head instead of following the last stre
- **Head:** the user row of this turn. When this turn has no user row (rectification choice tap, opening, auto-continue) the head is the new assistant row.
- **Pin:** on send (and on those rectification new-turn entries) the scroller places that row at the top with a `space-4` gap and then holds still while the reply grows downward.
- **Spacer:** the last assistant row's `min-height` is `calc(var(--conversation-viewport) - var(--latest-turn-head-height))`, both variables written onto the scroller by `useConversationScrollAnchor`. Not sticky, and `.conversation`'s `padding-bottom` is unchanged. The spacer lasts until the next send; switching sessions clears it.
- **Spacer:** the last turn's entry — the `.message-list` child that holds the assistant row, its `.message-actions`, follow-up chips and (rectification) delivery card — gets `min-height: calc(var(--conversation-viewport) - var(--latest-turn-head-height))` plus `align-content: start`, both variables written onto the scroller by `useConversationScrollAnchor`. The spacer trails the whole turn: the actions row sits right under the text at its own `margin: -4px 0 8px`, and the empty space comes after it (BUG-1042; the assistant row itself never carries the spacer — that pushed the actions half a screen down). `align-content: start` keeps the rectification wrap's grid rows from stretching into the space. Not sticky, and `.conversation`'s `padding-bottom` is unchanged. The spacer lasts until the next send; switching sessions clears it.
- **History:** opening another session still lands on the newest content once.
- **Jump to latest:** if the growing turn (or the reader scrolling) leaves more than 96px below the fold, the shared chip appears; pressing it sticks to the bottom for the rest of the turn.