huskies: create 473_refactor_split_chat_tsx_into_smaller_components

.huskies/work/1_backlog/473_refactor_split_chat_tsx_into_smaller_components.md

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+---
+name: "Split Chat.tsx into smaller components"
+---
+
+# Refactor 473: Split Chat.tsx into smaller components
+
+## Current State
+
+- TBD
+
+## Desired State
+
+Chat.tsx is 1513 lines and growing. ChatInput and ChatHeader are already split out. Break up the remaining monolith into focused components — likely candidates: message list/rendering, websocket connection management, message bubbles, typing indicators, and any other distinct UI concerns.
+
+## Acceptance Criteria
+
+- [ ] Chat.tsx reduced to under 500 lines by extracting components
+- [ ] Message list/rendering extracted into its own component
+- [ ] Message bubble rendering extracted into its own component
+- [ ] WebSocket connection logic extracted (hook or provider)
+- [ ] All existing Chat.test.tsx tests still pass
+- [ ] No visual or behavioural regressions in the chat UI
+
+## Out of Scope
+
+- TBD