feat: Add interactive game-specific action sounds via Web Audio API

[HarshitaShakya]

Closes #632

🎵 What this PR does

Expands the existing audio system to support dynamic, game-specific sound effects that trigger instantly based on player interactions, while strictly honouring the global mute state.

🛠️ Changes Made

New File — web-app/js/audioManager.js

• Centralized audio controller using Web Audio API (no external audio files needed)
• Generates all sounds synthetically — zero assets, no CORS, instant playback
• Reads localStorage.soundEnabled to respect existing navbar mute toggle
• Exposes AudioManager.play(name) globally for all game files to use

Game Audio Hooks Added

Game	Sound Events
🐍 Snake	snake_eat on food, snake_die on collision
🔨 Whack-a-Mole	mole_hit on hit, wrong on miss, game_over on timeout
🪙 Coin Flip	card_flip on flip, game_win on correct, wrong on incorrect
🎮 2048	score_point on merge, game_win on 2048 tile, game_over on stuck

Other Changes

• web-app/index.html — loads audioManager.js before all project scripts
• web-app/assets/sounds/ — directory added for future real audio clip support
• web-app/css/styles.css — fixed unclosed CSS rule in .card-icon block

✅ Technical Highlights

• Web Audio API — no .mp3 files needed, works offline
• Each sound call creates a fresh oscillator — rapid triggers never lag
• All calls wrapped in if (window.AudioManager) guard — audio bugs can never crash gameplay
• Non-fatal error handling — try/catch on every play call

🧪 Testing

• Tested all 4 games locally
• AudioManager.list() returns all 10 sounds in browser console
• Mute toggle correctly silences all game sounds
• No console errors during gameplay

[vercel]

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[github-actions]

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