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/imitate-auto.md

@@ -100,20 +100,21 @@ allowed-tools: SlashCommand(*), TodoWrite(*), Read(*), Write(*), Bash(*)
 
 ```bash
 # Generate run ID
-run_id = "run-$(date +%Y%m%d-%H%M%S)"
+run_id = "run-$(date +%Y%m%d)-$RANDOM"
 
 # Determine base path and session mode
 IF --session:
     session_id = {provided_session}
-    base_path = ".workflow/WFS-{session_id}/design-{run_id}"
+    relative_base_path = ".workflow/WFS-{session_id}/design-{run_id}"
     session_mode = "integrated"
 ELSE:
     session_id = null
-    base_path = ".workflow/.design/{run_id}"
+    relative_base_path = ".workflow/.design/design-{run_id}"
     session_mode = "standalone"
 
-# Create base directory
-Bash(mkdir -p "{base_path}")
+# Create base directory and convert to absolute path
+Bash(mkdir -p "{relative_base_path}")
+base_path=$(cd "{relative_base_path}" && pwd)
 
 # Step 0.1: Intelligent Path Detection
 code_files_detected = false