Fix game controls - keyboard and touch input now working properly

[Copilot]

Fixed critical controls issue where arrow keys, WASD keys, and touch controls were completely non-functional, preventing gameplay.

Issues Fixed

Touch Controls:

• Touch events were using touch.clientX directly with canvas width, which are different coordinate systems
• Fixed by using canvas.getBoundingClientRect() to properly calculate touch coordinates relative to the canvas
• Added preventDefault() to touch events to prevent default browser behavior

Keyboard Controls:

• Enhanced focus management by adding keyboard event listeners directly to the canvas element in addition to existing window listeners
• Added click-to-focus functionality so the canvas properly receives keyboard input when clicked
• Ensured both arrow keys (←/→/↑) and WASD keys work for movement and jumping

Technical Changes

// Before: Incorrect touch coordinate calculation
if (touch.clientX < width / 3) keys.left = true;

// After: Proper coordinate calculation
const rect = canvas.getBoundingClientRect();
const touchX = touch.clientX - rect.left;
const canvasWidth = canvas.width;
if (touchX < canvasWidth / 3) keys.left = true;

• Added duplicate keyboard event listeners on canvas element for better focus handling
• Enhanced focus management with click listener: canvas.addEventListener('click', () => canvas.focus())
• Added proper preventDefault() calls to all touch events

Controls Now Working 🎮

• Arrow Keys: ← and → for movement, ↑ for jumping
• WASD Keys: A/D for movement, W for jumping
• Touch/Mobile: Left third of screen moves left, right third moves right, center area makes character jump

Players can now properly control the character on both desktop and mobile devices. The character moves smoothly left and right, and jumps when grounded.

Fixes #5.

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