Add task link cards

[klopez4212]

Summary

• Add Buzz task deep links and task card rendering in markdown.
• Render pasted task links as composer cards with minimum width so they do not collapse.
• Keep automatic agent reply routing out of this slice so agent activation remains explicit.

Stack

1. Add agent task conversation foundation #1323
2. Add channel task surface #1324
3. This PR
4. Gate channel tasks experiment #1275

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

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

Line 290 in a0d386a

disabled={!onOpenAgentConversation || !message}

Enable task rows whose source message is not cached

When a task marker is in the current history window but the original agent reply is not (for example, an old task with a recent title/summary marker, since the channel query only loads a bounded recent history window), this disables the row's Open action even though the task is listed. That leaves users unable to open the task from the Tasks tab unless they first switch back to Messages and page far enough to load the old source event; use the marker/link IDs to fetch or route to the task instead of requiring message to already be present.

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buzz/desktop/src/shared/ui/markdown.tsx

Line 2396 in 55e113d

onOpenAgentConversationLink,

Restore the task-link navigation callback

In any Markdown render, this runtime object still references onOpenAgentConversationLink, but the callback definition that used to create it was removed just above. That leaves the identifier unbound, so the desktop TypeScript build fails before task-link cards can render; recreate the callback that calls goChannel(link.channelId, { taskReplyId: link.agentReplyId }).

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buzz/desktop/src/shared/ui/markdown.tsx

Line 2396 in 55e113d

onOpenAgentConversationLink,

Restore task-link open callback

In any Markdown render, onOpenAgentConversationLink is now referenced in the runtime object even though the local useCallback that defined it was deleted just above this block. That leaves an unbound identifier, so the markdown component fails to compile or throws before messages can render; restore the callback that routes with goChannel(link.channelId, { taskReplyId: link.agentReplyId }) before storing it in runtimeRef.

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Preserve the single task agent when replying

Fresh evidence in the current code is that this handler still forwards the composer's mentionPubkeys unchanged. In a task conversation with one routeable agent, the composer says Message <agent>, but a plain follow-up has no explicit mention; useSendMessageMutation passes this list to buildReplyTags, which only emits recipient p tags from mentionPubkeys, while ACP defaults to mention-filtered subscriptions. Those replies therefore miss the agent unless the user manually @mentions it, so merge the sole routeable agent into the send mentions here.

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