Gate channel tasks experiment

[klopez4212]

Summary

• Put the channel Tasks / continued agent conversation surface behind the new channel-tasks Experiments flag.
• Gate task markers, task tabs, task links, deep links, composer cards, and persisted task state when the experiment is disabled.
• Keep Gate channel tasks experiment #1275 as the top PR in the stack so the existing review thread remains attached to the final rollout gate.

Stack

1. Add agent task conversation foundation #1323
2. Add channel task surface #1324
3. Add task link cards #1325
4. This PR

Snapshots

Task marker and recap

Channel Tasks tab

Tests

• git diff --check origin/main..HEAD
• cd desktop && pnpm check:file-sizes && ./node_modules/.bin/tsc --noEmit
• cd desktop && pnpm test
• cargo test --manifest-path desktop/src-tauri/Cargo.toml deep_link --lib
• Snapshot capture: cd desktop && pnpm exec playwright test tests/e2e/agent-task-snapshots.spec.ts --project=smoke --config playwright.config.ts using a temporary local spec that was removed before commit.

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buzz/desktop/src/features/sidebar/ui/AppSidebar.tsx

Line 520 in 69de848

next.delete(activeAgentConversationChannelId);

Preserve channel unread badges while a task is open

When a task conversation is selected, this drops the entire source channel from the unread ID set based only on the channel id. In the scenario where that channel also has unrelated unread messages, the task screen only marks the task thread messages read, so deleting the channel here hides the sidebar badge/overflow indicator for real unread content until the user leaves the task. Keep the channel unread state visible, or subtract only the task thread’s messages rather than suppressing the whole channel.

---

buzz/desktop/src/features/channels/ui/ChannelPane.tsx

Line 507 in 69de848

onOpenThread(threadMessage);

Scroll to the agent reply from task rows

For markers whose agent reply is inside a thread (parentMessageId is set), the Tasks view switches back to Messages and only opens threadMessage. handleOpenThread clears the thread scroll target, so “Go to message” lands on the thread root/parent rather than the marker’s agentReplyId; in a busy thread the source reply can remain off-screen or hidden. Pass the agent reply as a route/scroll target (or set the thread target to marker.agentReplyId) before returning.

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buzz/desktop/src/features/channels/ui/ChannelPane.tsx

Lines 572 to 574 in 7570128

	if (marker.parentMessageId) {
	onOpenThread(threadMessage);
	return;

Target the reply when opening task messages

When a task was started from a reply (marker.parentMessageId is set), the Tasks tab's “Go to message” path opens only threadMessage and returns without setting any scroll/highlight target for the actual task reply. In long threads this lands at the thread head/default position rather than the source reply the button promises to show; route through the existing deep-link target logic or propagate message.id as the thread scroll target after opening the thread.

---

buzz/desktop/src/features/messages/ui/MessageTimeline.tsx

Line 280 in 7570128

() => buildTimelineItems(deferredEntries, firstUnreadMessageId),

Build scroll indexes with the same day-divider option

When showInitialDayDivider is false (as in the agent conversation screen), the child list omits the initial divider, but this parent timelineItems call still uses the default that includes it. That makes virtualizerOption.itemCount and indexByMessageId one row larger than the rendered TimelineMessageList, so bottom pinning or target convergence can scroll to the wrong/out-of-range index; pass showInitialDayDivider into this buildTimelineItems call and include it in the deps.

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Defer opening tasks until the agent resolves

When a user clicks New task/Open before the member/managed/relay agent lookups have populated (or for a historical agent that is not in those lists), resolveTaskAgentForMessage returns null and these empty fallbacks create the conversation with no routeable agent. If the user sends the first follow-up in that state, AgentConversationScreen has no routeableAgentPubkeys, so the reply is published without the agent p tag and the ACP subscriber will not receive it. The task deep-link path now waits for agent lookup readiness; the click path should do the same or fall back to the marker/source agent instead of opening with empty agent fields.

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