nexus/.planning/milestones/v1.3-phases/25-file-system/25-03-SUMMARY.md

phase	plan	subsystem	tags	dependency_graph	tech_stack	key_files	decisions	metrics
25-file-system	03	chat-files-ui	file-preview chat-ui file-upload server-query	requires provides affects 25-01 25-02 ChatFilePreview ChatFileCard file-render-in-message attach-files-on-send ChatMessage ChatPanel server/chat.ts	added patterns ChatFilePreview delegates to ChatFileCard for all non-image types inArray batch query for files after listMessages, merged in-memory completedFileIds captured before clearCompleted, parallel PATCH for each fileId	created modified ui/src/components/ChatFileCard.tsx ui/src/components/ChatFilePreview.tsx ui/src/components/ChatMessage.tsx ui/src/components/ChatMessageList.tsx ui/src/components/ChatPanel.tsx ui/src/api/chat.ts server/src/services/chat.ts	ChatFilePreview shows inline image with max-h-[300px] + ChatFileCard below for download; non-image types render ChatFileCard only listMessages fetches chatFiles with inArray(messageId) as second query; merged in-memory (no join, no schema change) completedFileIds captured before clearCompleted in handleSend to avoid race with state update addMessage returns files: [] for consistency with listMessages shape	duration completed_date tasks files_modified 3 minutes 2026-04-01 2 7

Phase 25 Plan 03: File Preview and Full Flow Wiring Summary

One-liner: ChatFilePreview (inline images) and ChatFileCard (download cards) wired end-to-end: upload -> attach to message -> render previews with server-side file loading in listMessages.

Tasks Completed

Task	Name	Commit	Files
1	Create ChatFilePreview and ChatFileCard	6053f30e	ChatFilePreview.tsx, ChatFileCard.tsx
2	Wire files into ChatMessage, ChatPanel, server	64ec8588	ChatMessage.tsx, ChatMessageList.tsx, ChatPanel.tsx, chat.ts (api), chat.ts (server)

What Was Built

ChatFileCard (ui/src/components/ChatFileCard.tsx)

• Compact file attachment card with lucide icon per category (ImageIcon, FileCode, FileText, File)
• Shows original filename (truncated), human-readable size (B/KB/MB via formatFileSize)
• Download anchor with download attribute and target="_blank" for one-click download
• Theme-aware: bg-muted border-border rounded-lg — works across Catppuccin Mocha, Tokyo Night, Catppuccin Latte

ChatFilePreview (ui/src/components/ChatFilePreview.tsx)

• Images: inline <img> with loading="lazy", max-h-[300px] rounded-lg object-contain, wrapped in clickable link for full-size
• Images also render ChatFileCard below for download button
• All other categories (code, document, other): render ChatFileCard only
• No complexity of fetching file content for syntax highlighting — code files show as downloadable cards

Server: listMessages with files (server/src/services/chat.ts)

• After fetching messages, collects all message IDs
• Second query: SELECT * FROM chat_files WHERE message_id IN (...) ordered by createdAt asc
• Groups by messageId into a Map, attaches files array to each message
• Imports: inArray from drizzle-orm, chatFiles from @paperclipai/db
• addMessage returns { ...message, files: [] } for shape consistency

ChatMessage files rendering (ui/src/components/ChatMessage.tsx)

• Added files?: ChatFile[] prop
• Renders <div className="mt-2 flex flex-col gap-2"> with ChatFilePreview for each file
• Applied to both user message bubble and assistant message sections

ChatPanel upload orchestration (ui/src/components/ChatPanel.tsx)

• Calls useChatFileUpload(activeConversationId) for pendingFiles, addFile, removeFile, clearCompleted, completedFileIds
• Passes pendingFiles, onRemoveFile, onFilesPicked to ChatInput
• handleSend: captures completedFileIds before clearing, calls chatApi.attachFilesToMessage after postMessage, then clearCompleted(), then invalidates messages query

chatApi.attachFilesToMessage (ui/src/api/chat.ts)

• Promise.all(fileIds.map(id => api.patch('/files/:id', { messageId }))) — parallel PATCH calls

Deviations from Plan

None — plan executed exactly as written.

Known Stubs

None — all file data flows from server to UI. File previews render real content from /api/files/:id/content.

Self-Check: PASSED