refactor: standardize UI design workflow folder naming and add absolute path conversion

Unified folder naming format across all UI design commands:
- Session mode: .workflow/WFS-{session}/design-run-YYYYMMDD-RANDOM
- Standalone mode: .workflow/.design/design-run-YYYYMMDD-RANDOM

Key changes:
- Standardized run directory naming to design-run-* format
- Added absolute path conversion for all base_path variables
- Updated path discovery patterns from design-* to design-run-*
- Maintained backward compatibility for existing directory discovery

Modified commands (10 files):
- explore-auto.md, imitate-auto.md: Unified standalone path format
- explore-layers.md: Changed from design-layers-* to design-run-*
- capture.md: Added design- prefix to standalone mode
- animation-extract.md, style-extract.md, layout-extract.md,
  generate.md, batch-generate.md: Added absolute path conversion
- update.md: Updated path discovery pattern

Technical improvements:
- Eliminates path ambiguity between command and agent execution contexts
- Ensures all file operations use absolute paths for reliability
- Provides consistent directory structure across workflows

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

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

.claude/commands/workflow/ui-design/update.md

@@ -28,7 +28,7 @@ Synchronize finalized design system references to brainstorming artifacts, prepa
 CHECK: .workflow/.active-* marker files; VALIDATE: session_id matches active session
 
 # Verify design artifacts in latest design run
-latest_design = find_latest_path_matching(".workflow/WFS-{session}/design-*")
+latest_design = find_latest_path_matching(".workflow/WFS-{session}/design-run-*")
 
 # Detect design system structure
 IF exists({latest_design}/style-extraction/style-1/design-tokens.json):