Idrinth / habit-evaluator / 22054655054

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Add Cypress E2E code coverage collection for website and homepage (#409)

Cypress E2E tests were running but not collecting or reporting code
coverage. This adds Istanbul instrumentation via vite-plugin-istanbul
and @cypress/code-coverage to both the website and homepage projects.

Key changes:
- Install @cypress/code-coverage and vite-plugin-istanbul in both projects
- Configure vite-plugin-istanbul with forceBuildInstrument and requireEnv
  (only instruments when VITE_COVERAGE=true is set)
- Register @cypress/code-coverage task in cypress.config.ts
- Import @cypress/code-coverage/support in Cypress support files
- Add custom afterEach hook to send coverage data after SvelteKit's
  async module loading completes (fixes timing issue with window:load)
- Add .nycrc.json configs outputting lcov to coverage-cypress/
- Update CI e2e job to build with VITE_COVERAGE=true and upload
  coverage reports to Coveralls with website-e2e/homepage-e2e flags
- Add coverage-cypress/, .nyc_output/, coverage/ to .gitignore

https://claude.ai/code/session_01CrnPgzd9bU6sCQqxpZDk4C

Co-authored-by: Claude <noreply@anthropic.com>

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