Add UI Design Commands: List and Reference Page Generator

- Implemented the '/workflow:ui-design:list' command to list all available design runs with metadata including session, created time, and prototype count.
- Developed the '/workflow:ui-design:reference-page-generator' command to generate multi-component reference pages and documentation from design run extraction, including setup, validation, and preview generation phases.
- Added detailed error handling and usage examples for both commands to enhance user experience and clarity.

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

@@ -69,7 +69,7 @@ allowed-tools: SlashCommand(*), TodoWrite(*), Read(*), Write(*), Bash(*)
 - `--session <id>`: Workflow session ID
   - Integrate into existing session (`.workflow/WFS-{session}/`)
   - Enable automatic design system integration (Phase 4)
-  - If not provided: standalone mode (`.workflow/.design/`)
+  - If not provided: standalone mode (`.workflow/`)
 
 **Input Rules**:
 - Must provide: `--input` OR (legacy: `--images`/`--prompt`)
@@ -98,7 +98,7 @@ allowed-tools: SlashCommand(*), TodoWrite(*), Read(*), Write(*), Bash(*)
 **Session Integration**:
 - `--session` flag determines session integration or standalone execution
 - Integrated: Design system automatically added to session artifacts
-- Standalone: Output in `.workflow/.design/{run_id}/`
+- Standalone: Output in `.workflow/{run_id}/`
 
 ## 5-Phase Execution
 
@@ -188,7 +188,7 @@ IF --session:
     session_mode = "integrated"
 ELSE:
     session_id = null
-    relative_base_path = ".workflow/.design/{design_id}"
+    relative_base_path = ".workflow/{design_id}"
     session_mode = "standalone"
 
 # Create base directory and convert to absolute path