Modernize to React 18 with JRPG adventure mode

[Copilot]

Converts the vanilla JS monster database to React 18 and adds a turn-based JRPG game mode following Legend of Zelda theme.

React Migration

• Components: Header, MonsterDatabase, MonsterCard, SearchSection with React hooks
• Routing: React Router v6 for Monster Database / Adventure Mode navigation
• Build: Vite 7 with HMR, proxy to Express backend (3000→3001)
• State: useState/useEffect for UI, localStorage for game persistence

JRPG Game Mode

• Combat: Turn-based with Attack/Potion/Flee, damage = Power - Defense/2 ± variance
• Progression: XP-based leveling, stats scale (+20% HP, +15% Power/Defense per level)
• Encounters: 9 monsters, difficulty scales with player level (1-3: weak, 4-6: medium, 7+: bosses)
• Death: -10% XP penalty, respawn at full HP

Security Preserved

• XSS: React escaping + manual escapeHtml() for search results
• SQL: Parameterized queries unchanged in Express backend
• Rate limiting, input validation, error sanitization intact

Technical Details

// Game state management
const [player, setPlayer] = useState(null);
const [currentEnemy, setCurrentEnemy] = useState(null);

// Combat damage calculation
const calculateDamage = (attacker, defender) => {
  const baseDamage = attacker.power - Math.floor(defender.defense / 2);
  const variance = Math.floor(Math.random() * 10) - 5;
  return Math.max(1, baseDamage + variance);
};

// Level scaling
if (newExp >= player.expToNext) {
  updatedPlayer.maxHp = Math.floor(player.maxHp * 1.2);
  updatedPlayer.power = Math.floor(player.power * 1.15);
  // ...
}

Screenshots

Monster Database (original features preserved)

Adventure Mode - Battle System

Adventure Mode - Stats & Exploration

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Run: npm install && npm start → http://localhost:3001
Build: 243KB JS (78KB gzip), 12KB CSS (3KB gzip)
Security: CodeQL clean, 0 vulnerabilities

Original prompt

Modernize the Hyrule monster database application. Use the latest version of React.

In a separate tab add a game mode where you randomly encounter monster, level up, gain experience and such. It should be JRPG style following the Legend of Zelda

Custom agent used: Reactifier
Analyzes an existing application and converts it into a fully functioning React-based version, preserving all functionality while using the latest React version, updating dependencies, and refreshing documentation for developers.

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