Add comprehensive mobile support with touch controls and responsive design

Implemented full mobile optimization to make the game mobile-ready:

**Core Mobile Support:**
- Updated viewport meta tag to prevent zoom and improve touch responsiveness
- Added mobile web app meta tags for iOS/Android standalone mode
- Enhanced CSS to prevent text selection, pull-to-refresh, and tap highlights
- Configured Phaser scale system with min/max bounds (320x240 to 1920x1080)
- Added fullscreen support for game container

**Touch Controls:**
- Added mobile device detection to HuntingScene
- Automatically default to touch controls on mobile devices
- Hide keyboard control instructions on mobile
- Only hide cursor on desktop (preserve default cursor on mobile)
- Adjusted messaging for mobile ("Tap to shoot" vs "Click to shoot")

**Touch Feedback:**
- Added pointerdown/pointerup handlers to all interactive buttons
- Buttons now scale down when pressed (0.95x) for tactile feedback
- Maintained hover effects for desktop compatibility
- Updated IntroScene "SET SAIL" button with touch feedback
- Updated MapScene location markers and close button
- Updated TransitionScene continue button
- All touch feedback works on both touch and mouse inputs

**Backward Compatibility:**
- All desktop functionality preserved
- Hover effects still work on desktop
- Keyboard controls available on desktop
- Touch and mouse inputs work seamlessly together

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/scenes/IntroScene.js

@@ -48,7 +48,7 @@ export default class IntroScene extends Phaser.Scene {
             fontStyle: 'bold'
         }).setOrigin(0.5);
 
-        // Button hover effects
+        // Button hover effects (desktop)
         buttonBg.on('pointerover', () => {
             buttonBg.setFillStyle(0x4a90c4);
         });
@@ -57,8 +57,17 @@ export default class IntroScene extends Phaser.Scene {
             buttonBg.setFillStyle(0x2d5f8e);
         });
 
-        // Button click handler
+        // Touch feedback (works on both touch and mouse)
         buttonBg.on('pointerdown', () => {
+            buttonBg.setFillStyle(0x4a90c4);
+            buttonBg.setScale(0.95);
+            buttonText.setScale(0.95);
+        });
+
+        buttonBg.on('pointerup', () => {
+            buttonBg.setFillStyle(0x2d5f8e);
+            buttonBg.setScale(1.0);
+            buttonText.setScale(1.0);
             this.startGame();
         });