Pattern Matcher game created at `public/pattern-matcher.html`

Features implemented:
- **4 Game Modes**: Memory (classic), Speed (fast-paced), Endless (progressive difficulty), Practice (no timer)
- **Pattern Types**: Colors and shapes combined
- **Time Pressure**: Dynamic timer that speeds up with levels, visual countdown bar
- **Scoring**: Base points + time bonus + streak multipliers
- **Sound Effects**: Unique tone for each color, success/fail jingles, tension-building timer ticks
- **Leaderboard**: Top 5 high scores per mode saved to localStorage
- **Mobile Support**: Touch-optimized buttons, responsive grid layout
- **Visual Feedback**: Pulse animations, color-coded messages, progress indicators

The game progressively increases difficulty by adding more items to sequences and reducing available time as you advance through levels.