story-kit: create 82_story_shift_enter_inserts_newline_instead_of_sending_in_chat_input

.story_kit/work/1_upcoming/82_story_shift_enter_inserts_newline_instead_of_sending_in_chat_input.md

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+---
+name: "Shift-Enter inserts newline instead of sending in chat input"
+test_plan: pending
+---
+
+# Story 82: Shift-Enter inserts newline instead of sending in chat input
+
+## User Story
+
+As a user, I want Shift+Enter to insert a newline in the chat input field, so that I can compose multi-line messages just like in Claude Code's terminal.
+
+## Acceptance Criteria
+
+- [ ] Shift+Enter inserts a newline in the chat input textarea instead of sending the message
+- [ ] Enter (without Shift) still sends the message as before
+- [ ] Multi-line input displays correctly in the textarea as the user types
+
+## Out of Scope
+
+- TBD