Add human-readable name fields to Chapter and Module types

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Summary

Chapters and Modules (v9 curriculum structures) only expose dashedName via API. They need human-readable name fields for consistency with other primitives.

Current State

Primitive	Human-readable name
Superblock	✅ name (PR #39)
Block	✅ name
Challenge	✅ title
Chapter	❌ only dashedName
Module	❌ only dashedName

Expected Transformation

dashedName: "html"                  → name: "HTML"
dashedName: "basic-html"            → name: "Basic HTML"
dashedName: "html-forms-and-tables" → name: "HTML Forms And Tables"

Implementation Checklist

Follow the Superblock pattern from PR #39:

• Add optional name to RawChapter and RawModule interfaces
• Add required name to ChapterData and ModuleData interfaces
• Update normalizeChapter() and normalizeModule() to generate names via dashedNameToTitle()
• Add name: String! to GraphQL Chapter and Module types
• Regenerate types