chore: update React to 19.2.3

[taearls]

Summary

• Update react from ^19.2.0 to ^19.2.3
• Update react-dom from ^19.2.0 to ^19.2.3
• Update ROADMAP.md with changelog entry

Test plan

• All 160 unit tests passing
• Production build successful
• No breaking changes (minor version update within React 19)

Closes #77

🤖 Generated with Claude Code

[cloudflare-workers-and-pages]

Deploying portfolio with    Cloudflare Pages

Latest commit:	9fe7398
Status:	✅  Deploy successful!
Preview URL:	https://1aef923e.portfolio-next.pages.dev
Branch Preview URL:	https://chore-update-react-19-2-3.portfolio-next.pages.dev

View logs

[taearls]

Summary

Simple dependency update PR that bumps React and React DOM from ^19.2.0 to ^19.2.3, a minor patch update within React 19.

Changed files: 3 files, +37 additions, -12 deletions
Impact areas: Dependencies (React core), Documentation (ROADMAP.md)
Review depth: Full validation

Quality Checks Results

• ✅ Linting: npm run lint:check - Pass
• ✅ Format checking: npm run format:check - Pass
• ✅ Tests: npm run test - Pass (160/160 tests)
• ✅ Build: npm run build - Pass

Code Review Findings

✅ Positive Observations

1. Clean dependency update - Only updates the specific packages needed (react, react-dom)
2. Proper version bump - Uses caret (^) versioning to allow compatible updates
3. Good documentation - ROADMAP.md updated with changelog entry documenting the change
4. Thorough validation - PR description confirms all tests and build pass

Testing Analysis

• Coverage: All 160 existing tests pass
• Test quality: No regressions detected from dependency update
• Compatibility: Minor version update within React 19 - no breaking changes expected

Security Review

• ✅ No exposed secrets
• ✅ Dependencies from official npm registry
• ✅ Standard React packages (trusted source)

Documentation Review

• ✅ ROADMAP.md updated with changelog entry
• ✅ Last updated date refreshed
• ✅ Clear documentation of what changed

Recommendations

None - this is a clean, well-documented dependency update.

Approval Status

✅ APPROVE - Simple dependency update with all checks passing. No breaking changes expected from this minor React version bump.

---

Review completed using: npm run lint:check, npm run format:check, npm run test, npm run build
Reviewed by: Claude Code Agent