From c2633823fb5bfe39d9bb2d284d8bec6c111b9a06 Mon Sep 17 00:00:00 2001
From: Adam Malczewski <github@tradam.dev>
Date: Mon, 29 Jun 2026 12:12:18 +0900
Subject: feat(chat): cancel a queued steering message from the UI
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Implements the frontend for the cancel-queued-message backend feature
(transport-contract 0.23.0 → 0.24.0, ADDITIVE). While a turn is generating
and a user message is queued (awaiting steering delivery), the user can now
cancel a single queued message by id so it never runs.

- Consume the contract: regenerate the .dispatch/transport-contract.reference.md
  mirror to 0.24.0; add chat.queue.cancel to the exhaustive WsClientMessage
  guard (core/wire/conformance.ts) + its test.
- ChatTransport port accepts ChatQueueCancelMessage; cancelQueuedMessage(id)
  on the chat store + app store sends chat.queue.cancel { conversationId,
  messageId } (fire-and-forget, idempotent — the server no-ops an already-
  drained/unknown id).
- UI: a × cancel affordance per queued row in MessageQueueList.svelte,
  threaded through SurfaceView's onCancelQueuedMessage (dispatched on
  rendererId, never the surface id) and wired to store.cancelQueuedMessage.
  Optimistic removal (pure selectVisibleMessages/reconcileCancelledIds in
  logic/message-queue.ts) hides the row on click and reconciles from the
  message-queue surface's post-cancel snapshot. No new event handling — the
  existing surface subscription reflects the result.

Tests: +12 (chat store cancel op ×3, optimistic-removal logic ×11 already
existed pattern, MessageQueueList component cancel behavior ×9).

Repo fix: package.json + bun.lock were still pinning file:../dispatch-backend/...
(stale from the dispatch-backend → backend rename) — corrected to
file:../backend/packages/...; bun install now resolves natively with no
worktree symlink hack.

typecheck 0/0, 1140 tests green (run twice), biome clean, build OK.
---
 src/app/App.svelte | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/app/App.svelte')

diff --git a/src/app/App.svelte b/src/app/App.svelte
index 7e5ac7d..e4e5bbc 100644
--- a/src/app/App.svelte
+++ b/src/app/App.svelte
@@ -296,6 +296,10 @@
 		store.queueMessage(text);
 	}
 
+	function handleCancelQueuedMessage(messageId: string) {
+		store.cancelQueuedMessage(messageId);
+	}
+
 	function handleStop() {
 		store.stopGeneration();
 	}
@@ -625,7 +629,11 @@
 			     the generic SurfaceView (dispatches on rendererId, never surface id);
 			     only shown when the queue is non-empty — an idle queue is hidden. -->
 			<div class="px-4 pt-2">
-				<SurfaceView spec={messageQueueSpec} onInvoke={handleInvoke} />
+				<SurfaceView
+					spec={messageQueueSpec}
+					onInvoke={handleInvoke}
+					onCancelQueuedMessage={handleCancelQueuedMessage}
+				/>
 			</div>
 		{/if}
 
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