- Add Markdown/Raw rendering toggle support to DocumentsView and TaskDocumentsTab for consistent document preview behavior
- Reuse workflow-style toggle UX and markdown CSS patterns to align with existing dashboard design conventions
- Add comprehensive tests for DocumentsView and TaskDocumentsTab toggle interactions and rendering states
- Update dashboard guide documentation to describe the new Markdown/Raw toggle behavior
- Add recursive markdown file discovery in file-service with excluded directories and sorted metadata output
- Expose GET /api/files/markdown and wire a frontend API client plus useProjectMarkdownFiles hook
- Redesign DocumentsView with project/task tabs, search, task grouping, and desktop/mobile file preview flows
- Add coverage for markdown scanning and DocumentsView behaviors, and update useDocuments tests for new API usage
