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kandev/docs/specs/ui/system-design/composer-focus-hint.md
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2026-09-18 16:03:51 +01:00

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status, system, requirements
status system requirements
current ui
REQ-UI-COMPOSER-FOCUS-HINT-001

Composer Focus Hint System Design

Purpose and boundaries

The shared composer owns presentation across task chat and quick chat. This change affects neither session state nor shortcut dispatch.

Requirement mapping

Requirement Design section
REQ-UI-COMPOSER-FOCUS-HINT-001 Components and control flow

Components and control flow

shouldShowChatFocusHint in use-chat-input-container.ts currently derives state eligibility without viewport information. Keep that state policy intact. In ChatInputBody, read isMobile from useResponsiveBreakpoint and derive one effective visibility value: showFocusHint && !isMobile. Use it for both ChatInputFocusHint.visible and the editor's conditional pr-28 class. This keeps direct consumers and viewport transitions consistent and avoids hiding only the hint while retaining wasted editor space.

Mobile composition

Use the existing inline composer and mobile slash-command flow as the nearest exemplar (e2e/tests/chat/mobile-slash-command-composer.spec.ts). The editor and send action retain their order, touch targets, scroll owner, dynamic viewport, and safe-area behavior. No additional drawer, navigation, or persisted state is needed. Width below 768px defines phone scope even with a fine pointer.

Compatibility and recovery

The existing reactive breakpoint hook updates on boundary changes without remounting the editor. Wider touch devices retain current behavior. No new translation, API, persistence, permission, logging, or metrics contract is introduced. Existing editor focus and submission handlers are unchanged.

Verification

Component tests drive the responsive hook through mobile and wider states, checking hint absence and removal of reserved padding together. Existing state predicate tests preserve wider eligibility. Playwright verifies phone tapping, slash-command entry, submission, and wider-screen hint behavior.

Implementation Plans