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/style-extract.md

@@ -51,8 +51,10 @@ ELSE IF extraction_mode == "explore":
     variants_count = --variants OR 3  # Default to 3 for explore mode
     VALIDATE: 1 <= variants_count <= 5
 
-# Determine base path
-bash(find .workflow -type d -name "design-*" | head -1)  # Auto-detect
+# Determine base path (auto-detect and convert to absolute)
+relative_path=$(find .workflow -type d -name "design-run-*" | head -1)
+base_path=$(cd "$relative_path" && pwd)
+bash(test -d "$base_path" && echo "✓ Base path: $base_path" || echo "✗ Path not found")
 # OR use --base-path / --session parameters
 ```
 
@@ -533,7 +535,7 @@ Next: /workflow:ui-design:layout-extract --session {session_id} --targets "..."
 ### Path Operations
 ```bash
 # Find design directory
-bash(find .workflow -type d -name "design-*" | head -1)
+bash(find .workflow -type d -name "design-run-*" | head -1)
 
 # Expand image pattern
 bash(ls {images_pattern})