chore(mobile-expo): unit tests for data layer and critical hooks

[up-tandem]

Summary

• Extract loadExperience from useExperience hook for direct testability (no rendering library needed)
• Add 10 tests covering fetch routing (watchHome vs by-slug), fallback logic, and error propagation
• Add Testing section to README with commands and conventions
• All acceptance criteria from chore(mobile-expo): Unit tests for data layer and critical components #97 verified (14 test suites, 107 tests)

Resolves #97

Acceptance criteria checklist

• Data layer tests: fetch paths covered (experienceService.test.ts — 8 tests)
• Mapping tests for all 10 section types (sectionMapper.test.ts — 17 tests)
• Nested content tests: Section→content, Container→slots→content (sectionMapper.test.ts)
• MediaCollection variant tests (all 5) (MediaCollectionRenderer.test.tsx)
• SectionDispatcher dispatch tests (SectionDispatcher.test.tsx — 11 tests)
• useExperience load logic tests (useExperience.test.ts — 10 tests)
• Tests run in CI (jest via pnpm test)
• README updated with how to run tests

Contracts Changed

No

Regeneration Required

No

Validation

Test Suites: 14 passed, 14 total
Tests:       107 passed, 107 total
Lint:        0 warnings

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1122b612-96f0-4ba2-b2e6-2b7bb061559c

📥 Commits

Reviewing files that changed from the base of the PR and between 79726af and b91a75f.

📒 Files selected for processing (3)

• mobile/expo/README.md
• mobile/expo/src/hooks/useExperience.test.ts
• mobile/expo/src/hooks/useExperience.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/97-expo-unit-tests

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