Decouple travel and cooking fuel mechanics

- Travel is now free (no fuel cost for sailing between locations)
- Fuel is only consumed for cooking whale oil (2 fuel per whale)
- Updated TransitionScene to show "The wind carries your sails..." when no fuel cost
- Removed fuel checks from MapScene travel methods
- Added fuel validation in HuntingScene - can't process whales without fuel
- This sets up the penguin burning mechanic for when cooking fuel runs low

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

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

src/scenes/HuntingScene.js

@@ -366,6 +366,24 @@ export default class HuntingScene extends Phaser.Scene {
         whale.setData('alive', false);
         harpoon.setData('active', false);
 
+        // Check if enough fuel to process the whale
+        if (this.inventory.fuel < 2) {
+            // Not enough fuel to cook the oil!
+            this.tweens.add({
+                targets: whale,
+                alpha: 0,
+                y: whale.y + 50,
+                duration: 1000,
+                onComplete: () => {
+                    whale.destroy();
+                }
+            });
+            harpoon.destroy();
+
+            this.showMessage('Whale hit but no fuel to process it! Need 2 fuel to cook whale oil.');
+            return;
+        }
+
         // Whale death animation
         this.tweens.add({
             targets: whale,
@@ -381,13 +399,16 @@ export default class HuntingScene extends Phaser.Scene {
         // Remove harpoon
         harpoon.destroy();
 
+        // Consume fuel for processing
+        this.inventory.fuel -= 2;
+
         // Reward
         this.inventory.whaleOil += 1;
         this.whalesHunted++;
         this.updateStats();
 
         // Show success message
-        this.showMessage(`Whale hunted! +1 Whale Oil (Total: ${this.inventory.whaleOil})`);
+        this.showMessage(`Whale hunted! +1 Whale Oil, -2 Fuel (Oil: ${this.inventory.whaleOil}, Fuel: ${this.inventory.fuel})`);
 
         // Success flash
         const flash = this.add.rectangle(400, 300, 800, 600, 0xffffff, 0.3);