Add JSDoc documentation to App.js

[Copilot]

Added comprehensive JSDoc documentation to frontend/src/App.js covering file overview, all functions, and complex logic sections.

Documentation Added

• File-level: JSDoc header describing the superhero comparison application, its two views (table/comparison), and dependencies
• Functions (8 total): Complete JSDoc with @param, @returns, and descriptions for:
  • App - Main component managing state and view switching
  • handleHeroSelection - Selection logic with FIFO replacement when 2+ heroes selected
  • isHeroSelected - Selection state checker
  • handleCompare / handleBackToTable - View navigation
  • calculateWinner - Stat-by-stat comparison algorithm returning winner and score
  • renderComparison / renderTable - View rendering functions
• Inline comments: Logic clarifications for FIFO replacement, winner determination, and major UI sections

Example

/**
 * Calculates which hero wins in a head-to-head comparison.
 * 
 * Compares six power stats (intelligence, strength, speed, durability, power, combat)
 * between two heroes. Each stat comparison awards one point to the hero with the higher
 * value. The hero with the most points wins. If the points are equal, it's a tie.
 * 
 * @param {Object} hero1 - The first superhero object
 * @param {Object} hero1.powerstats - Object containing the hero's power statistics
 * @param {Object} hero2 - The second superhero object
 * @param {Object} hero2.powerstats - Object containing the hero's power statistics
 * @returns {Object} An object containing the winner and the score
 * @returns {Object|null} returns.winner - The winning hero object, or null if it's a tie
 * @returns {string} returns.score - The score in "X-Y" format
 */
const calculateWinner = (hero1, hero2) => { ... }

No functional changes - documentation only.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add documentation to frontend/src/App.js</issue_title>
<issue_description>Add documentation to frontend/src/App.js:

• Overall file doc
• Function docs
• Inline docs</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add documentation to frontend/src/App.js #4

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