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Add support for uploading Markdown, Text, Word (.docx), CSV, Excel (.xlsx), PDF, and PowerPoint (.pptx) files in addition to existing JPEG/PNG image uploads in the spec creation and project expansion chat interfaces. Backend changes: - New server/utils/document_extraction.py: in-memory text extraction for all document formats using python-docx, openpyxl, PyPDF2, python-pptx (no disk persistence) - Rename ImageAttachment to FileAttachment across schemas, routers, and chat session services - Add build_attachment_content_blocks() helper in chat_constants.py to route images as image content blocks and documents as extracted text blocks - Separate size limits: 5MB for images, 20MB for documents - Handle extraction errors (corrupt files, encrypted PDFs) gracefully Frontend changes: - Widen accepted MIME types and file extensions in both chat components - Add resolveMimeType() fallback for browsers that don't set MIME on .md files - Document attachments display with FileText icon instead of image thumbnail - ChatMessage renders documents as compact pills with filename and size - Update help text from "attach images" to "attach files" Dependencies added: python-docx, openpyxl, PyPDF2, python-pptx Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>