🐛 fix debug cross: clear+redraw each frame at world-space center, no transforms

src/systems/CameraSystem.ts

@@ -57,12 +57,9 @@ export class CameraSystem {
       d:     kb.addKey(Phaser.Input.Keyboard.KeyCodes.D),
     }
 
-    // Debug cross — positioned in world space at viewport center, updated each frame
+    // Debug cross — redrawn every frame in world space, no transforms needed
     this.debugCross = this.scene.add.graphics()
     this.debugCross.setDepth(999)
-    this.debugCross.lineStyle(2, 0xff0000, 1)
-    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) => {
@@ -134,13 +131,15 @@ 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
+    // Redraw debug cross every frame at viewport center in world space
     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)
+      const cx  = cam.scrollX + cam.width  / (2 * cam.zoom)
+      const cy  = cam.scrollY + cam.height / (2 * cam.zoom)
+      const arm = 12 / cam.zoom   // 12 screen pixels at any zoom
+      this.debugCross.clear()
+      this.debugCross.lineStyle(2 / cam.zoom, 0xff0000, 1)
+      this.debugCross.lineBetween(cx - arm, cy, cx + arm, cy)
+      this.debugCross.lineBetween(cx, cy - arm, cx, cy + arm)
     }
 
     // Periodically save camera center as "player position"