Add pirate-themed language throughout game

Ship Deck Scene:
- "Yer Whaling Vessel" instead of "The Whaling Vessel"
- "Ahoy, matey!" welcome message
- Pirate expressions in barrel messages (Arr!, Aye!, fer, yer)
- "ye scurvy dog" in instructions
- "savvy?" in penguin messages

Intro Scene:
- "A Whaling Adventure on the High Seas"
- "SET SAIL" button instead of "START GAME"
- "Cast off and seek yer fortune!" instructions

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

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

src/scenes/IntroScene.js

@@ -26,7 +26,7 @@ export default class IntroScene extends Phaser.Scene {
         title.setStroke('#000000', 3);
 
         // Subtitle
-        this.add.text(400, 210, 'An 18th Century Whaling Voyage', {
+        this.add.text(400, 210, 'A Whaling Adventure on the High Seas', {
             fontSize: '22px',
             fill: '#cccccc',
             fontStyle: 'italic'
@@ -42,7 +42,7 @@ export default class IntroScene extends Phaser.Scene {
         buttonBg.setStrokeStyle(3, 0xffffff);
         buttonBg.setInteractive({ useHandCursor: true });
 
-        const buttonText = this.add.text(400, 400, 'START GAME', {
+        const buttonText = this.add.text(400, 400, 'SET SAIL', {
             fontSize: '28px',
             fill: '#ffffff',
             fontStyle: 'bold'
@@ -63,7 +63,7 @@ export default class IntroScene extends Phaser.Scene {
         });
 
         // Instructions text
-        this.add.text(400, 530, 'Click to begin your adventure', {
+        this.add.text(400, 530, 'Click to cast off and seek yer fortune!', {
             fontSize: '16px',
             fill: '#ffff99'
         }).setOrigin(0.5);