feat: add interactive multi-selection mechanism for UI design workflow

- Add --interactive flag to style-extract and layout-extract commands
- Enhance animation-extract --mode interactive with selection storage
- Implement unified user-selections storage in .intermediates/user-selections/
- Add parameter passthrough in explore-auto (default: enabled) and imitate-auto (always enabled)
- Support fallback to generate all variants when no selection file exists
- Fix explore-auto.md bug: duplicate --base-path in import-from-code call (line 313)

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

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

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

@@ -41,7 +41,7 @@ IF depth NOT IN [1, 2, 3, 4, 5]:
 relative_path=$(if [ -n "$BASE_PATH" ]; then
   echo "$BASE_PATH"
 elif [ -n "$SESSION_ID" ]; then
-  find .workflow/WFS-$SESSION_ID/design-* -type d | head -1 || \
+  find .workflow/WFS-$SESSION_ID/design-* -type d -printf "%T@ %p\n" 2>/dev/null | sort -nr | head -1 | cut -d' ' -f2 || \
   echo ".workflow/WFS-$SESSION_ID/design-run-$(date +%Y%m%d)-$RANDOM"
 else
   echo ".workflow/.design/design-run-$(date +%Y%m%d)-$RANDOM"