Update CLAUDE.md with reasoning trace support documentation

- Document new reasoning trace detection and display features
- Add implementation details for reasoning-parser.js module
- List supported datasets and UI components
- Include feature descriptions and technical details

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

CLAUDE.md

@@ -8,6 +8,35 @@ OCR Text Explorer is a modern, standalone web application for browsing and compa
 
 ## Recent Updates
 
+### Reasoning Trace Support (Added 2025-08-07)
+
+The application now supports displaying reasoning traces from models like NuMarkdown-8B-Thinking that include their analysis process in the output:
+
+**Features:**
+- Automatic detection of `<think>` and `<answer>` XML-like tags in improved text
+- Collapsible "Model Reasoning" panel showing the model's thought process
+- Clean separation of reasoning from final output for better readability
+- Reasoning statistics (word count, percentage of total output)
+- Support for formatted reasoning steps with numbered analysis points
+- "Reasoning Trace" badge indicator in the statistics panel
+
+**Implementation Details:**
+- New `reasoning-parser.js` module handles detection and parsing of reasoning traces
+- Supports multiple reasoning formats (`<think>`, `<thinking>`, `<reasoning>` tags)
+- Formats numbered steps from reasoning content for structured display
+- Caches parsed reasoning to avoid reprocessing
+- Exports include optional reasoning trace content
+
+**Supported Datasets:**
+- `davanstrien/india-medical-ocr-test` - Medical documents processed with NuMarkdown-8B-Thinking
+- Any dataset with reasoning traces in supported XML-like formats
+
+**UI Components:**
+- Collapsible reasoning panel with smooth animations
+- Step-by-step reasoning display with numbered indicators
+- "Final Output" label when reasoning is present
+- Dark mode optimized styling for reasoning sections
+
 ### Markdown Rendering Support (Added 2025-08-01)
 
 The application now supports rendering markdown-formatted VLM output for improved readability: