Pre-position XR camera at cockpit before VR entry

Use setTransformationFromNonVRCamera to set XR reference space
to ship cockpit position before entering immersive mode. This
prevents camera jumping on Quest when the 2D preloader disappears.

Also includes:
- Ship physics tuning (reduced force multipliers and fuel consumption)
- Fix reverse thrust direction in shipPhysics.ts

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

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

src/core/gameConfig.ts

@@ -6,10 +6,10 @@ import log from './logger';
 const DEFAULT_SHIP_PHYSICS = {
     maxLinearVelocity: 200,
     maxAngularVelocity: 1.4,
-    linearForceMultiplier: 500,
-    angularForceMultiplier: .5,
-    linearFuelConsumptionRate: 0.0002778,   // 1 minute at full thrust (60 Hz)
-    angularFuelConsumptionRate: 0.0001389,   // 2 minutes at full thrust (60 Hz)
+    linearForceMultiplier: 400,
+    angularForceMultiplier: .4,
+    linearFuelConsumptionRate: 0.00002778,   // 1 minute at full thrust (60 Hz)
+    angularFuelConsumptionRate: 0.00001389,   // 2 minutes at full thrust (60 Hz)
     linearDamping: 0.2,
     angularDamping: 0.6, // Moderate damping for 2-3 second coast
     alwaysActive: true,  // Prevent physics sleep (false may cause abrupt stops at zero velocity)

src/core/handlers/levelSelectedHandler.ts

@@ -1,4 +1,4 @@
-import { AudioEngineV2, Engine, ParticleHelper } from "@babylonjs/core";
+import { AudioEngineV2, Engine, FreeCamera, ParticleHelper, Vector3 } from "@babylonjs/core";
 import { DefaultScene } from "../defaultScene";
 import { Level1 } from "../../levels/level1";
 import Level from "../../levels/level";
@@ -87,6 +87,16 @@ export function createLevelSelectedHandler(context: LevelSelectedContext): (e: C
             if (DefaultScene.XR) {
                 try {
                     preloader.updateProgress(75, 'Entering VR...');
+
+                    // Pre-position XR camera at ship cockpit before entering VR
+                    // This prevents camera jump on Quest when immersive mode starts
+                    const spawnPos = config.ship?.position || [0, 0, 0];
+                    const cockpitPosition = new Vector3(spawnPos[0], spawnPos[1] + 1.2, spawnPos[2]);
+                    const tempCamera = new FreeCamera("tempCockpit", cockpitPosition, DefaultScene.MainScene);
+                    DefaultScene.XR.baseExperience.camera.setTransformationFromNonVRCamera(tempCamera, true);
+                    tempCamera.dispose();
+                    log.debug('[Main] XR camera pre-positioned at cockpit:', cockpitPosition.toString());
+
                     xrSession = await DefaultScene.XR.baseExperience.enterXRAsync('immersive-vr', 'local-floor');
                     log.debug('XR session started successfully (render loop paused until camera is ready)');
                 } catch (error) {
@@ -171,11 +181,9 @@ export function createLevelSelectedHandler(context: LevelSelectedContext): (e: C
                     });
                 }
 
-                // Hide preloader
+                // Hide preloader immediately - SceneFader handles visual transition
                 preloader.updateProgress(100, 'Ready!');
-                setTimeout(() => {
                 preloader.hide();
-                }, 500);
 
                 // Hide UI (no longer remove from DOM - let Svelte routing handle it)
                 log.info('[Main] ========== HIDING UI FOR GAMEPLAY ==========');

src/levels/level1.ts

@@ -106,7 +106,7 @@ export class Level1 implements Level {
         xr.baseExperience.camera.position = new Vector3(0, 1.2, 0);
         log.debug('[Level1] XR camera parented to cameraRig at position (0, 1.2, 0)');
 
-        // Show the canvas now that camera is properly positioned in ship
+        // Show the canvas now that camera is parented
         const canvas = document.getElementById('gameCanvas');
         if (canvas) {
             canvas.style.display = 'block';

src/ship/shipPhysics.ts

@@ -60,7 +60,6 @@ export class ShipPhysics {
         const currentSpeed = currentLinearVelocity.length();
 
         let linearMagnitude = 0;
-        let angularMagnitude = 0;
 
         // Apply linear force from left stick Y (forward/backward)
         if (Math.abs(leftStick.y) > 0.15) {
@@ -81,7 +80,7 @@ export class ShipPhysics {
                     );
 
                     // Apply reverse thrust factor: forward at full power, reverse at reduced power
-                    const thrustMultiplier = thrustDirection < 0
+                    const thrustMultiplier = thrustDirection > 0
                         ? 1.0  // Forward thrust at full power
                         : this._config.reverseThrustFactor;  // Reverse thrust scaled down
 
@@ -109,7 +108,7 @@ export class ShipPhysics {
         }
 
         // Calculate rotation magnitude for torque
-        angularMagnitude =
+        let angularMagnitude =
             Math.abs(rightStick.y) +
             Math.abs(rightStick.x) +
             Math.abs(leftStick.x);