feat(storybook): Add Web Component support to story generator

The Storybook generator now supports Web Components in addition to React:

- Added ComponentType enum (REACT, WEB_COMPONENT)
- Enhanced _parse_component to detect Web Components via HTMLElement/customElements
- Added _parse_web_component to extract attributes from JSDoc and observedAttributes
- Added _generate_csf3_web_component for Web Component story generation
- Updated file patterns to include .js files
- Moved ds-button.js to src/components/ for proper discovery
- Fixed missing requests import in figma.py

The generator now successfully generates Storybook stories for admin-ui's
ds-button Web Component with all variants, sizes, and states.

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

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

admin-ui/ds.config.json

@@ -24,5 +24,5 @@
     ]
   },
   "created_at": "2025-12-10T12:52:18.513773",
-  "updated_at": "2025-12-10T13:01:40.642236"
+  "updated_at": "2025-12-10T13:46:05.807775"
 }