Fix GitHub Pages deployment by resolving TypeScript compilation errors

[Copilot]

The GitHub Pages deployment was failing because the React application had multiple TypeScript compilation errors that prevented the build step from succeeding. When npm run build fails, no artifacts are created in the build/ directory, causing GitHub Pages to fall back to deploying repository content directly (showing the README instead of the PWA application).

Issues Fixed

1. Duplicate function definitions in TestModal.tsx

The file contained malformed code with incomplete and duplicate handleNext function definitions:

// Broken code causing compilation error
const handleNext = () => {
    // ... incomplete implementation
    onComplete(answers);
const areAllQuestionsAnswered = (questions: TestQuestion[], answers: TestAnswer[]): boolean => {
    // Function defined inside another function
};
const handleNext = () => {
    // Duplicate function definition
};

2. Missing function import in TestResults.tsx

The component was calling getActivityTypeByName() without importing it, causing TS2304: Cannot find name 'getActivityTypeByName'.

3. Missing constant in testUtils.ts

The file referenced MODERATE_FATIGUE_THRESHOLD without defining it, causing TS2304: Cannot find name 'MODERATE_FATIGUE_THRESHOLD'.

Verification

The build now completes successfully and generates all necessary PWA artifacts:

• index.html with correct /rest-tracker-app/ path prefixes
• manifest.json with proper PWA configuration
• service-worker.js with correct caching setup
• .nojekyll and _redirects files for GitHub Pages compatibility

The GitHub Actions workflow will now successfully build and deploy the PWA application instead of falling back to the README page.

Fixes #16.

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