nexus/.planning/phases/25-file-system/25-02-SUMMARY.md

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
25-file-system	02	ui	react file-upload drag-and-drop clipboard xhr lucide	phase provides 25-file-system-00 shared types (ChatFile, ChatFileUploadResponse), validators phase provides 25-file-system-01 server endpoint POST /api/conversations/:id/files	ChatFileDropZone component with drag-and-drop overlay useChatFileUpload hook with upload lifecycle (uploading/done/error) chatApi.uploadFile using XHR with progress callbacks ChatInput updated with file picker button, paste handler, and pending file chips	25-03 25-04 chat-panel-integration	added patterns XHR for upload progress tracking (not fetch, which lacks upload progress) PendingFile client-side state lifecycle before server confirmation ChatFileDropZone wraps children with drag overlay without breaking layout	created modified ui/src/components/ChatFileDropZone.tsx ui/src/hooks/useChatFileUpload.ts ui/src/api/chat.ts ui/src/components/ChatInput.tsx ui/src/components/ChatInput.test.tsx	Used XHR instead of fetch for chatApi.uploadFile to enable upload progress events (fetch lacks upload.onprogress) ChatFileDropZone checks e.currentTarget.contains(e.relatedTarget) to avoid false drag-leave when crossing child elements onFilesPicked is optional — ChatInput works without file support when prop not provided (backward compatible)	PendingFile pattern: temp client ID assigned immediately, replaced with server ChatFile.id on completion Drop zone overlay uses bg-primary/10 and border-primary for theme-neutral visual feedback	FILE-05	15min	2026-04-01

Phase 25 Plan 02: File Upload UI Summary

Drag-and-drop, clipboard paste, and file picker wired into ChatInput via ChatFileDropZone and useChatFileUpload with XHR progress tracking

Performance

• Duration: ~15 min
• Started: 2026-04-01T23:10:00Z
• Completed: 2026-04-01T23:25:00Z
• Tasks: 2
• Files modified: 5

Accomplishments

• chatApi.uploadFile implemented with XMLHttpRequest for upload progress callbacks
• useChatFileUpload hook manages PendingFile lifecycle (uploading → done/error)
• ChatFileDropZone component provides drag-over overlay with dashed border and theme-neutral colors
• ChatInput now accepts all three file input methods: drag-and-drop, clipboard paste (onPaste), file picker (Paperclip button)
• Pending file chips shown above textarea with spinner, progress %, and remove button
• 3 new tests added: file attach button presence, onFilesPicked callback, pending chip rendering

Task Commits

Each task was committed atomically:

1. Task 1: Add chatApi.uploadFile and create useChatFileUpload hook - 6a83a362 (feat)
2. Task 2: Create ChatFileDropZone and integrate into ChatInput - 6b530afa (feat)

Files Created/Modified

• ui/src/api/chat.ts - Added uploadFile method using XHR with FormData and progress callbacks
• ui/src/hooks/useChatFileUpload.ts - Created PendingFile state management hook
• ui/src/components/ChatFileDropZone.tsx - Created drag-and-drop wrapper with overlay
• ui/src/components/ChatInput.tsx - Added file props, paste handler, Paperclip button, pending chips, ChatFileDropZone wrapper
• ui/src/components/ChatInput.test.tsx - Added 3 file upload tests

Decisions Made

• Used XHR for uploadFile to get upload progress events (fetch API doesn't expose upload.onprogress)
• ChatFileDropZone uses e.currentTarget.contains(e.relatedTarget) guard on dragLeave to prevent flicker when cursor moves over child elements
• ChatInput backward-compatible: onFilesPicked/pendingFiles/onRemoveFile are all optional props

Deviations from Plan

None — plan executed exactly as written.

Issues Encountered

None.

User Setup Required

None — no external service configuration required.

Next Phase Readiness

• File upload UI complete; ChatPanel needs wiring to call useChatFileUpload and pass pendingFiles/onFilesPicked/onRemoveFile to ChatInput
• Plan 25-03 (server routes) and Plan 25-04 (ChatPanel wiring) can proceed

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Phase: 25-file-system Completed: 2026-04-01