[Phase 2] Write remaining documentation pages

[afucher]

Complete all remaining documentation pages: API reference, guides, contributing, and changelog.

Deliverable

A comprehensive documentation site with 20+ pages covering the full public API, advanced guides, and contribution guidelines.

Acceptance Criteria

• API Reference section completed:

  • docs/api/chart.md — Chart class (constructor, radix, scale, calibrate)
  • docs/api/radix.md — Radix class (all draw* methods, aspects, transit)
  • docs/api/transit.md — Transit class (all methods, animate)
  • docs/api/aspect-calculator.md — AspectCalculator (radix, transit methods)
  • docs/api/zodiac.md — Zodiac utility (getSign, getHouseNumber, etc.)
  • docs/api/settings.md — Complete Settings reference table
  • docs/api/types.md — All TypeScript types documented

• Remaining Guides completed:

  • docs/guides/custom-settings.md — Settings examples with live demos
  • docs/guides/custom-symbols.md — CUSTOM_SYMBOL_FN hook example
  • docs/guides/multiple-charts.md — Two charts on one page
  • docs/guides/click-events.md — Click areas and DOM integration

• Framework Integration Guides (bonus if not already included):

  • docs/guides/frameworks/react.md — useRef + useEffect pattern
  • docs/guides/frameworks/vue.md — ref + onMounted pattern
  • docs/guides/frameworks/angular.md — @ViewChild + ngAfterViewInit pattern
  • Each with copy-pasteable component examples and SSR notes

• docs/changelog.md created:

  • Manually maintained starting from v3.0.2
  • Format: ## [3.0.2] – YYYY-MM-DD with Added/Fixed/Changed sections
  • Link to GitHub Releases for older history

• `docs/contributing.md" completed:

  • Bug reporting (link to issue templates)
  • Symbol requests
  • PR workflow
  • Dev setup (npm ci, npm test, npm run build)
  • Code style summary
  • Ko-fi and GitHub Sponsors links
  • Link to CODE_OF_CONDUCT.md

• All pages have frontmatter with title field

• Sidebar config (astro.config.mjs) updated to include all new pages

• No broken links (internal or external)

• Spelling and grammar checked

• Search index builds and includes all pages

Related Plan Section

docs-plan.md §4.3 (Page-by-Page Content Spec)