story-kit: create 168_bug_agent_message_queue_limited_to_one_line

.story_kit/work/1_upcoming/168_bug_agent_message_queue_limited_to_one_line.md

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+---
+type: bug
+title: Agent message queue limited to one line
+---
+
+# Bug 168: Agent message queue limited to one line
+
+## Description
+
+Story 155 added the ability to queue messages while an agent is busy. However, the queue appears to be limited to a single line — if you type multiple messages while the agent is working, only the last one is retained. Users need to be able to queue multiple messages.
+
+## How to Reproduce
+
+1. Open the web UI and start a conversation with a busy agent
+2. Type and send a message while the agent is processing
+3. Type and send a second message
+4. Observe that only the most recent queued message is shown/retained
+
+## Expected Result
+
+Multiple queued messages should be retained and delivered to the agent in order when it becomes available.
+
+## Key files
+
+- `frontend/src/components/` — chat/agent interaction components where message queuing is implemented
+- `server/src/` — if server-side queuing is involved
+
+## Acceptance Criteria
+
+- [ ] Users can queue multiple messages while an agent is busy
+- [ ] Queued messages are delivered in order
+- [ ] UI shows all queued messages, not just the latest
+- [ ] All tests pass