chore: add shared components and update docs

- Add vendor selector component for admin pages
- Add input macros for form handling
- Add truck icon for shipping UI
- Update vendor operations expansion plan
- Update mkdocs configuration
- Update dependencies

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mkdocs.yml

@@ -133,6 +133,8 @@ nav:
       - Multi-Marketplace Product Architecture: development/migration/multi-marketplace-product-architecture.md
       - Product Migration Database Changes: development/migration/product-migration-database-changes.md
       - Vendor Operations Expansion: development/migration/vendor-operations-expansion.md
+    - Implementation Plans:
+      - Admin Inventory Management: implementation/inventory-admin-migration.md
     - Seed Scripts Audit: development/seed-scripts-audit.md
     - Database Seeder:
       - Documentation: development/database-seeder/database-seeder-documentation.md
@@ -186,6 +188,7 @@ nav:
   - User Guides:
     - User Management: guides/user-management.md
     - Product Management: guides/product-management.md
+    - Inventory Management: guides/inventory-management.md
     - Shop Setup: guides/shop-setup.md
     - CSV Import: guides/csv-import.md
     - Marketplace Integration: guides/marketplace-integration.md