FE-1793: Brunch assistant follow-ups and improvements

[kostandinang]

🌟 What is the purpose of this PR?

Fix the Bugbot findings left open when the FE-1793/FE-1795 stack merged that #9883 doesn't cover: Brunch tabs fading like stock tabs, and a Live voice turn splitting across two conversations. It also stops Activity hiding its last tools behind a nested scroll, and shows the wait for Brunch where that turn's Activity will appear. #9883 fixes the stock styling findings.

🔗 Related links

• FE-1793 (internal)
• #9829 findings: Brunch tabs inherit stock fade, Tab marks ignore presentation, Stock transcript chrome not gated
• #9836 finding: In-flight turns follow conversation switches

🚫 Blocked by

• #9883, branch ka/fe-1808-presentation-split.

Stack: main → #9883 → this PR.

🔍 What does this change?

• Tabs: the stock tab fade and hover colours now apply only to stock tabs, so Brunch tabs get their own selected and hover styling.
• Activity: Brunch Activity no longer caps its height with an inner scrollbar. The cap hid the last tools ("Used 5 tools" showed four) and the newest tool while streaming. The transcript already scrolls to follow new content.
• Waiting row: the waiting row now sits in the transcript where the turn's Activity will appear, and the Working… header that replaces it keeps the spinner until the work ends. The status row above the composer now shows only while the host tab hides the chat.
• Activity wording: turn labels no longer name Brunch. The waiting row and the Ledger status read Working…, the Voice brief reads Preparing request, Sending request, then Request sent, and the Voice dock says Answer captured. Working on it. Build with Brunch in the File menu stays.
• Activity stays put: Live's spoken reply no longer takes the Working… row, which used to jump down when Brunch's response arrived. The label also stays still when the spinner changes to the Activity icon.
• Live turns across a conversation switch:
  • A turn that reaches submission after you've switched conversations isn't sent to the new one. Its words go back to the composer as unsent, and Live is told the request wasn't submitted.
  • A turn already submitted when you switch stays in its original conversation, and Live is told so.
  • Captions and previews stay in the conversation the turn began in, as before.

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

• Adds patch changesets for @hashintel/petrinaut.

📜 Does this require a change to the docs?

• Yes. docs/ai-assistant.md now says Activity scrolls with the conversation and describes where the waiting state appears.

🕸️ Does this require a change to the Turbo Graph?

• No.

⚠️ Known issues

• The website can't hit the Live bug today: switching conversations remounts the Live control and ends the session. The fix covers LiveConversationControl's support for a session that outlives a conversation switch, which its tests exercise.
• One bridge test expected a turn prepared before a switch to still be sent afterwards, which was the bug. New tests replace it.
• Not tested with a real provider or microphone.

🐾 Next steps

None planned.

🛡 What tests cover this?

• New: stock tabs keep their fade and Brunch tabs don't; stock and Brunch transcripts keep their own bubble and spacing.
• New: Activity lists all five of five counted tools without an inner scrollbar.
• Updated: waiting shows a pending Working… row in the transcript, which the Working… fold replaces; with Ledger selected, the status row reports Working…. Brief, status and dock tests use the new labels. The BrunchWaitingForResponse story's play test passes in Chat and Voice.
• New: Live's spoken reply never takes the Working… row, in Voice or Chat. The BrunchVoiceTurnActivity story checks that the Activity label stays in the same spot from waiting to finished, and BrunchStreamingActivity now checks the same through streaming updates.
• New: a turn prepared across a switch isn't sent, its words stay sendable, Live is told, and the next turn sends normally; a turn already sent is released and never summarized in the new conversation.
• On top of FE-1808: Separate stock and Brunch assistant presentations #9883, the Petrinaut UI suite (1,174 tests) and live-brunch-bridge.test.ts (89 tests) pass, apart from a known local localStorage failure that also happens on main.

❓ How to test this?

1. Run turbo run lint:tsc lint:eslint test:unit --filter @hashintel/petrinaut --filter @apps/petrinaut-website.
2. In a stock host with an extra tab, check that the inactive tab still fades.
3. In Brunch, check that the inactive tab doesn't fade and that Activity lists every tool without its own scrollbar.
4. Send a Brunch message and check that Working… appears in the conversation with a spinner, then gains a chevron as the Activity header without moving the composer. In Voice, check that both appear under Live's spoken reply in the same spot.

📹 Demo

A Voice turn from waiting to finished. Before, Working… attaches to Live's spoken reply and drops once Brunch responds. After, Working… waits under the spoken reply and gains its chevron in the same spot once Brunch's work starts.

pr-9886-activity-labels.mp4

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Project	Deployment	Actions	Updated
petrinaut	Ready	Preview	Oct 2, 2026 1:36pm UTC
petrinaut-docs	Ready	Preview	Oct 2, 2026 1:36pm UTC

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PR Summary

Medium Risk
Changes voice/Live submission and settlement when users switch conversations, plus visible Brunch transcript layout; well-covered by tests but touches mediation and UI state paths.

Overview
Refines Brunch Chat/Voice UX and fixes Live turns crossing conversation switches.

Transcript & Activity: Working… with a spinner now appears in the transcript where that turn’s Activity will land (not above the composer except on the Ledger host tab). Live’s spoken-reply messages no longer host the working row; a pending BrunchWorkPending placeholder keeps the label position when work streams in. Activity drops the inner max-height scrollbar so every tool stays visible in the main transcript scroll. The Activity header keeps the spinner until work finishes; copy shifts from “Brunch…” to Working…, Preparing request / Sending request / Request sent, and Answer captured. Working on it.

Tabs: Stock tab fade/opacity applies only when styleVariant is stock, so Brunch tabs keep their own hover/selected styling.

Live bridge: Turns prepared or submitted in a conversation that is no longer active are withdrawn or released—unsent text returns to the composer with notices to Live; in-flight submitted work no longer settles or summarizes in the new conversation.

Voice control: Re-selecting Voice while a session is still stopping is treated as connecting until the prior session ends, then auto-starts the next session (no retry UI flash).

Docs, changesets, and tests/stories cover the new placement, labels, tab styling, tool list height, and conversation-switch behavior.

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