docs(explore-auto): add animation-extraction folder structure

Add missing animation-extraction output structure:
- .intermediates/animation-analysis/: analysis-options.json (with embedded user_selection), animations-*.json (URL mode)
- animation-extraction/: animation-tokens.json, animation-guide.md

Complete file structure now includes all three extraction phases:
- style-extraction
- animation-extraction
- layout-extraction

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

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/workflow/ui-design/explore-auto.md

@@ -582,8 +582,10 @@ Design Quality:
 📂 {base_path}/
   ├── .intermediates/          (Intermediate analysis files)
   │   ├── style-analysis/      (analysis-options.json with embedded user_selection, computed-styles.json if URL mode)
+  │   ├── animation-analysis/  (analysis-options.json with embedded user_selection, animations-*.json if URL mode)
   │   └── layout-analysis/     (analysis-options.json with embedded user_selection, dom-structure-*.json if URL mode)
   ├── style-extraction/        ({s} complete design systems)
+  ├── animation-extraction/    (animation-tokens.json, animation-guide.md)
   ├── layout-extraction/       ({n×l} layout template files: layout-{target}-{variant}.json)
   ├── prototypes/              ({total} assembled prototypes)
   └── .run-metadata.json       (includes device type)