Fix scene doubling on reload and add dynamic inspector import

- Dispose old scene before creating new one (cleans up physics)
- Stop existing render loop before starting new one
- Dynamically import @babylonjs/inspector on 'i' key press

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

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

src/core/sceneSetup.ts

@@ -37,6 +37,8 @@ export async function setupScene(
     const audioEngine = await createAudioEngine();
     reporter.reportProgress(30, 'Audio engine ready');
 
+    // Stop any existing render loop before starting new one (prevents doubling on reload)
+    engine.stopRenderLoop();
     engine.runRenderLoop(() => DefaultScene.MainScene.render());
 
     return { engine, audioEngine };
@@ -50,6 +52,10 @@ function createEngine(canvas: HTMLCanvasElement): Engine {
 }
 
 function createMainScene(engine: Engine): void {
+    // Dispose old scene if it exists (prevents doubling on reload)
+    if (DefaultScene.MainScene && !DefaultScene.MainScene.isDisposed) {
+        DefaultScene.MainScene.dispose();
+    }
     DefaultScene.MainScene = new Scene(engine);
     DefaultScene.MainScene.ambientColor = new Color3(.2, .2, .2);
     DefaultScene.MainScene.clearColor = new Color3(0, 0, 0).toColor4();

src/ship/input/keyboardInput.ts

@@ -100,7 +100,8 @@ export class KeyboardInput {
         document.onkeydown = (ev) => {
             // Always allow inspector and camera toggle, even when disabled
             if (ev.key === 'i') {
-                // Toggle Babylon Inspector
+                // Dynamically import inspector on first use (keeps it out of main bundle)
+                import('@babylonjs/inspector').then(() => {
                     if (this._scene.debugLayer.isVisible()) {
                         this._scene.debugLayer.hide();
                     } else {
@@ -109,6 +110,7 @@ export class KeyboardInput {
                             showExplorer: true,
                         });
                     }
+                });
                 return;
             }