story-kit: queue 199_story_web_ui_submits_all_queued_items_at_once for merge

.story_kit/work/4_merge/199_story_web_ui_submits_all_queued_items_at_once.md

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+---
+name: "Web UI submits all queued items at once"
+---
+
+# Story 199: Web UI submits all queued items at once
+
+## User Story
+
+As a user, I want the web UI to submit all queued items at once when there are multiple waiting items, so that I don't have to wait for each queued message to be processed one-at-a-time.
+
+## Acceptance Criteria
+
+- [ ] TODO
+- [ ] When the agent finishes a response and multiple messages are queued, all queued messages are submitted together in a single chat request (as sequential user messages in the conversation history).
+- [ ] The queue is fully drained (all items removed) when the agent finishes a response, not just the first item.
+- [ ] When only one message is queued, behavior is equivalent to before (single message submitted).
+
+## Out of Scope
+
+- TBD