Fix broken App test and verify repo setup

[devin-ai-integration]

Summary

Fixes the failing unit test in App.test.jsx. The test was the default Create React App boilerplate and was never updated for this project. Two issues:

1. Missing context provider: App calls useAlert() which requires AlertContext. The test rendered <App /> without wrapping it in <AlertProvider>, causing a TypeError: Cannot destructure property 'showAlert' crash.
2. Wrong assertion: The test checked for "learn react" text, which doesn't exist — replaced with a check for the "WORDLE" header text.

Review & Testing Checklist for Human

• Verify the test mirrors how the app is mounted in src/index.js (wrapped in AlertProvider) — confirm no other context providers are missing
• Run CI=true npm test locally to confirm the test passes
• Consider whether additional smoke-test assertions would be valuable (e.g., grid renders, keyboard renders)

Notes

• Build (npm run build) passes cleanly
• Prettier check (npm run check) passes
• This is a smoke test only — it validates the app renders without crashing and the header is present

Link to Devin session: https://app.devin.ai/sessions/5bc58dee2c46438eaf0a670c66c534f2
Requested by: @matthewguerra-cog

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.