chore(mobile-expo): CI lint, typecheck, and build for Expo app

[up-tandem]

Summary

• Add dedicated lint-expo CI job that runs ESLint (--max-warnings=0), TypeScript typecheck (tsc --noEmit), and build validation for the Expo app (mobile/expo)
• Extend affected job to detect @forge/expo changes via Turbo affected analysis
• Exclude @forge/expo from main build-and-test lint step to avoid double-linting

Resolves #96

Contracts Changed

No

Regeneration Required

No

Validation

• CI workflow YAML syntax validated
• New lint-expo job follows existing lint-ios/lint-android pattern
• Job is conditional on @forge/expo being affected (no wasted CI minutes)

[coderabbitai]

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Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 58f4f0a8-456b-4da2-8f34-e0db476801ed

📥 Commits

Reviewing files that changed from the base of the PR and between 0b7321c and 00615de.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/96-expo-ci

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