Pull ChatBar's module-level pure helpers, constants, and the QueueEditState
type out of the 2.3k-line composer/index.tsx into a focused, testable
composer-utils.ts sibling:
- constants: COMPOSER_STACK_BREAKPOINT_PX, COMPOSER_SINGLE_LINE_MAX_PX,
COMPOSER_FADE_BACKGROUND, DRAFT_PERSIST_DEBOUNCE_MS
- helpers: pickPlaceholder, COMPLETION_ACTIONS, slashChipKindForItem,
slashArgStage, slashCommandToken, cloneAttachments
- type: QueueEditState
Pure restructuring, no behavior change; adds unit tests for the slash helpers.
(The ChatBar component itself is a single tightly-coupled megacomponent; a
deeper hook-based decomposition is left for a dedicated follow-up.)
dd659c8d17