#425: Storybook Stories & Documentation

[ethanluc7]

Related to issue: #425

Summary

Adds new stories for EntityRelationshipDiagram, SchemaNode, Filter Dropdown components. Also removes legacy SchemaRelationDiagram stories and unnecessary viewport testing story.

Description of Changes

• New story file: FilterDropdowns — 5 stories covering Default, SingleFilter, FilterSelected, EmptyState, NoConfig
• New story file: EntityRelationshipDiagram/EntityRelationshipDiagram — Moved from top-level, added autodocs and per-story descriptions for all 12 topology variants
• New story file: EntityRelationshipDiagram/SchemaDiagramNode — Replaced legacy viewer-diagram stories with the current SchemaNode component
• Updated intro page — index.mdx now uses the current RelationshipDiagramContent instead of the legacy SchemaRelationshipDiagram
• Removed: stories/viewer-diagram/ (legacy), DictionaryViewerViewport stories, WithSingleFilter/WithFilterDropdowns from DictionaryPage (moved to separate storybook story)

Readiness Checklist

• Self Review
  • I have performed a self review of code
  • I have run the application locally and manually tested the feature
  • I have checked all updates to correct typos and misspellings
• Formatting
  • Code follows the project style guide
  • Automated code formatters (ie. Prettier) have been run
• Local Testing
  • Successfully built all packages locally
  • Successfully ran all test suites, all unit and integration tests pass
• Updated Tests
  • Unit and integration tests have been added that describe the bug that was fixed or the features that were added
• Documentation
  • All new environment variables added to .env.schema file and documented in the README
  • All changes to server HTTP endpoints have open-api documentation
  • All new functions exported from their module have TSDoc comment documentation

[JamesTLopez]

🔥 Thanks for the clean up