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/features/chat/test-helpers.ts | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'src/features/chat/test-helpers.ts')

diff --git a/src/features/chat/test-helpers.ts b/src/features/chat/test-helpers.ts
index 26c5590..c99d1f4 100644
--- a/src/features/chat/test-helpers.ts
+++ b/src/features/chat/test-helpers.ts
@@ -1,4 +1,8 @@
-import type { ChatQueueMessage, ChatSendMessage } from "@dispatch/transport-contract";
+import type {
+  ChatQueueCancelMessage,
+  ChatQueueMessage,
+  ChatSendMessage,
+} from "@dispatch/transport-contract";
 import type { StoredChunk } from "@dispatch/wire";
 import type { ConversationCache } from "../conversation-cache";
 import type { ChatTransport, HistorySync, HistoryWindow, MetricsSync } from "./ports";
@@ -8,19 +12,25 @@ export interface FakeTransport {
   readonly sent: ChatSendMessage[];
   /** All `chat.queue` messages sent through the fake transport. */
   readonly sentQueue: ChatQueueMessage[];
+  /** All `chat.queue.cancel` messages sent through the fake transport. */
+  readonly sentCancels: ChatQueueCancelMessage[];
   readonly impl: ChatTransport;
 }
 
 export function createFakeTransport(): FakeTransport {
   const sent: ChatSendMessage[] = [];
   const sentQueue: ChatQueueMessage[] = [];
+  const sentCancels: ChatQueueCancelMessage[] = [];
   return {
     sent,
     sentQueue,
+    sentCancels,
     impl: {
       send(msg) {
         if (msg.type === "chat.queue") {
           sentQueue.push(msg);
+        } else if (msg.type === "chat.queue.cancel") {
+          sentCancels.push(msg);
         } else {
           sent.push(msg);
         }
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