Add Body Composition Calculator play

[deansereigns]

Before creating this PR, please confirm the following:

• I have read the ReactPlay Contributor Guidelines and Discussion
• I have reviewed the ReactPlay Code Review Checklist
• I have tested my changes locally and verified there are no new warnings or errors

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First thing, PLEASE READ THIS: ReactPlay Code Review Checklist

Description

This PR adds a new play called Body Composition Calculator to ReactPlay.

The calculator allows users to calculate:

• Basal Metabolic Rate (BMR)
• Total Daily Energy Expenditure (TDEE)

based on gender, age, height, weight, and activity level.

It provides real-time calculation and includes explanations of BMR and TDEE to help users understand their daily calorie requirements.

The play is implemented using TypeScript and follows ReactPlay's modular folder structure.

Fixes #1660
Issue link: #1660

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Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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How Has This Been Tested?

Tested locally using:

npm start

Verification steps:

1. Open ReactPlay in browser
2. Navigate to Body Composition Calculator play
3. Enter gender, age, height, weight, and activity level
4. Verify that:
   • Inputs accept values correctly
   • BMR is calculated correctly
   • TDEE is calculated correctly
   • Results update automatically
   • No console errors appear

Also verified using:

npm run lint

No new errors were introduced.

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Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new errors
• I have commented my code, particularly in hard-to-understand areas (Not applicable)
• I have added tests (Not applicable)
• New and existing unit tests pass locally with my changes (Not applicable)
• Any dependent changes have been merged and published in downstream modules (Not applicable)

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Screenshots or example output

This play includes:

• Interactive calculator UI
• Real-time BMR calculation
• Real-time TDEE calculation
• Explanation of BMR and TDEE
• Clean and responsive layout

[netlify]

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