Implement full-screen touch joystick and fullscreen toggle

[Copilot]

Mobile users needed screen-wide touch control for ship movement and fullscreen capability.

Changes

Full-Screen Joystick

• Touch area: Changed from fixed 150px joystick to entire gameContainer
• Dynamic positioning: Joystick center now set to touch coordinates, not bottom-left corner
• Visual feedback: Joystick renders at touch point with opacity fade (0→1 on touch, 1→0 on release)
• UI protection: Touch events filtered to exclude .touch-pause-button, .touch-fullscreen-button, and menu overlays

// Before: Limited touch area
this.joystick.addEventListener('touchstart', (e) => { ... });

// After: Full-screen control
gameContainer.addEventListener('touchstart', (e) => {
  if (target.closest('.touch-pause-button') || ...) return;
  this.handleJoystickStart(touch);
});

Fullscreen Button

• API: Cross-browser fullscreen with vendor prefixes (standard/webkit/moz/ms)
• UI: New button (⛶/⊗) positioned below pause button
• State sync: Listens to fullscreenchange events to update icon

CSS Changes

• Joystick: position: absolute → position: fixed with dynamic left/top
• Button z-index layering: joystick (100) < buttons (1000)

Screenshots

Portrait (375x667)

Gameplay

Landscape (812x375)

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