nexus/.planning/phases/26-pwa-performance/26-02-SUMMARY.md

phase	plan	subsystem	tags	dependency_graph	tech_stack	key_files	decisions	metrics	requirements_satisfied
26-pwa-performance	02	ui	mobile pwa responsive touch gestures	requires provides affects 26-00 mobile-chat-layout pull-to-refresh responsive-breakpoints ChatPanel ChatConversationList ChatInput MobileChatView	added patterns useMediaQuery hook with SSR-safe window.matchMedia + addEventListener usePullToRefresh with native DOM touch events (mirrors SwipeToArchive pattern) Conditional render in ChatPanel — mobile/desktop branch at function top	created modified ui/src/hooks/useMediaQuery.ts ui/src/hooks/usePullToRefresh.ts ui/src/components/PullToRefresh.tsx ui/src/components/MobileChatView.tsx ui/src/components/ChatPanel.tsx ui/src/components/ChatConversationList.tsx ui/src/components/ChatInput.tsx ui/src/components/ChatConversationItem.tsx	[Phase 26-02]: useMediaQuery uses addEventListener('change') not addListener() — addListener is deprecated in modern browsers [Phase 26-02]: PullToRefresh wraps ScrollArea in ChatConversationList, not the entire list component — keeps desktop layout unaffected [Phase 26-02]: MobileChatView uses useQuery for conversation title lookup (same key as ChatConversationList) — no extra API call due to React Query cache [Phase 26-02]: refetch from useChatConversations wrapped in void wrapper to satisfy PullToRefresh onRefresh type (void | Promise<void>) [Phase 26-02]: ChatConversationItem gets min-h-[48px] touch target to satisfy UI-SPEC requirement	duration completed_date tasks_completed files_changed ~20 min 2026-04-01 2 8	PWA-03 PWA-04 PWA-05

Phase 26 Plan 02: Mobile Responsive Chat Layout Summary

Mobile-first chat view with full-screen layout on phones, pull-to-refresh gesture, safe-area insets, and proper 44px/48px touch targets.

Tasks Completed

Task	Name	Commit	Files
1	Create useMediaQuery hook and PullToRefresh component	3a6adc7f	useMediaQuery.ts, usePullToRefresh.ts, PullToRefresh.tsx
2	Create MobileChatView and wire ChatPanel for responsive layout	78b04217	MobileChatView.tsx, ChatPanel.tsx, ChatConversationList.tsx, ChatInput.tsx, ChatConversationItem.tsx

What Was Built

useMediaQuery (ui/src/hooks/useMediaQuery.ts): SSR-safe hook that wraps window.matchMedia with addEventListener("change") for live updates. Returns boolean for any media query string.

usePullToRefresh (ui/src/hooks/usePullToRefresh.ts): Touch gesture hook with 64px threshold. Mirrors SwipeToArchive.tsx convention (native DOM events, not React synthetic). Fires navigator.vibrate(10) for haptic feedback on threshold trigger. Returns containerRef to attach to scroll container.

PullToRefresh (ui/src/components/PullToRefresh.tsx): Visual wrapper showing Loader2 spinner with "Pull to refresh" / "Release to refresh" text. Children are translated down by pull distance for visual feedback. Opacity scales with pull distance.

MobileChatView (ui/src/components/MobileChatView.tsx): Full-screen mobile chat at h-[100dvh] (not 100vh — avoids keyboard-shrink issue). Two views:

• No active conversation: conversation list with PullToRefresh, pb-16 to clear global MobileBottomNav
• Active conversation: 48px header with back button + title + agent selector, message list, sticky input bar with pb-[env(safe-area-inset-bottom)]

ChatPanel updates: Imports useMediaQuery and MobileChatView. Adds const isDesktop = useMediaQuery("(min-width: 768px)") at function top and returns <MobileChatView /> when !isDesktop. Desktop layout unchanged.

ChatConversationList updates: Wraps ScrollArea in <PullToRefresh onRefresh={() => { void refetch(); }} enabled={isMobile}>.

ChatInput updates: pb-[env(safe-area-inset-bottom)] on form container. Send button gets min-h-[44px] min-w-[44px].

ChatConversationItem updates: min-h-[48px] justify-center for touch target compliance.

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Type mismatch on PullToRefresh onRefresh prop

• Found during: Task 2 build
• Issue: refetch from useInfiniteQuery returns Promise<QueryObserverResult<...>>, not Promise<void>. TypeScript rejected the direct assignment.
• Fix: Wrapped in () => { void refetch(); } to satisfy the () => void | Promise<void> interface.
• Files modified: ui/src/components/ChatConversationList.tsx
• Commit: 78b04217

2. [Rule 2 - Missing critical functionality] ChatConversationItem touch targets

• Found during: Task 2 — review of UI-SPEC touch target rule (48px minimum)
• Issue: ChatConversationItem had py-1.5 resulting in under-48px height on mobile.
• Fix: Added min-h-[48px] justify-center to item container.
• Files modified: ui/src/components/ChatConversationItem.tsx
• Commit: 78b04217

Known Stubs

None — all components are wired with real data (useStreamingChat, useChatMessages, useChatConversations, etc.).

Self-Check: PASSED

Files verified present:

• ui/src/hooks/useMediaQuery.ts: FOUND
• ui/src/hooks/usePullToRefresh.ts: FOUND
• ui/src/components/PullToRefresh.tsx: FOUND
• ui/src/components/MobileChatView.tsx: FOUND

Commits verified:

• 3a6adc7f: FOUND
• 78b04217: FOUND

Build: PASSED (pnpm --filter @paperclipai/ui build succeeds)