🐛 fix debug cross: world-space position + counter-scale, tracks viewport center correctly

src/systems/CameraSystem.ts

@@ -57,14 +57,12 @@ export class CameraSystem {
       d:     kb.addKey(Phaser.Input.Keyboard.KeyCodes.D),
     }
 
-    // Debug cross at viewport center (fixed to screen, not world)
+    // Debug cross — positioned in world space at viewport center, updated each frame
     this.debugCross = this.scene.add.graphics()
-    this.debugCross.setScrollFactor(0).setDepth(999)
+    this.debugCross.setDepth(999)
     this.debugCross.lineStyle(2, 0xff0000, 1)
-    const cx = cam.width / 2
-    const cy = cam.height / 2
-    this.debugCross.lineBetween(cx - 12, cy, cx + 12, cy)
-    this.debugCross.lineBetween(cx, cy - 12, cx, cy + 12)
+    this.debugCross.lineBetween(-12, 0, 12, 0)
+    this.debugCross.lineBetween(0, -12, 0, 12)
 
     // Track mouse world position on every move so we have a stable value for zoom
     this.scene.input.on('pointermove', (ptr: Phaser.Input.Pointer) => {
@@ -136,6 +134,15 @@ export class CameraSystem {
     cam.scrollX = Phaser.Math.Clamp(cam.scrollX + dx, 0, worldW - cam.width / cam.zoom)
     cam.scrollY = Phaser.Math.Clamp(cam.scrollY + dy, 0, worldH - cam.height / cam.zoom)
 
+    // Keep debug cross at viewport center in world space, counter-scale so it stays 1px
+    if (this.debugCross) {
+      this.debugCross.setPosition(
+        cam.scrollX + cam.width  / (2 * cam.zoom),
+        cam.scrollY + cam.height / (2 * cam.zoom),
+      )
+      this.debugCross.setScale(1 / cam.zoom)
+    }
+
     // Periodically save camera center as "player position"
     this.saveTimer += delta
     if (this.saveTimer >= this.SAVE_TICK) {