Fix jigsaw camera bounds and piece tray to avoid overlapping the HUD

- Offset main camera scroll/zoom bounds by HUD_H so the play field
  never slides beneath the fixed top bar
- Shift the scattered-piece tray down by HUD_H to keep pieces clear of
  the target image and HUD
- Assign board panel, frame, and reference image to the main camera only
  so the fixed HUD camera doesn't draw their corners into the screen

src/games/jigsaw/JigsawGame.js

@@ -75,7 +75,7 @@ export default class JigsawGame extends Phaser.Scene {
     this.buildMenu();
     this.bindInput();
 
-    this.cameras.main.setBounds(0, 0, WORLD_W, WORLD_H);
+    this.cameras.main.setBounds(0, HUD_H, WORLD_W, WORLD_H - HUD_H);
     this.cameras.main.setZoom(1);
     this.cameras.main.setScroll(0, 0);
 
@@ -385,6 +385,9 @@ export default class JigsawGame extends Phaser.Scene {
     boardFrame.strokeRect(BOARD.x, BOARD.y, BOARD.size, BOARD.size);
     this.boardPanel = panel;
     this.boardFrame = boardFrame;
+    // Keep board on the main camera only (the fixed HUD camera would draw its
+    // top-left corner into the lower-right of the screen).
+    if (this.hudCam) { panel.cameraFilter = this.hudCam.id; boardFrame.cameraFilter = this.hudCam.id; }
 
     const srcImg = _imgCache[item.path];
     // Build the faint reference into a canvas texture (cover-cropped square),
@@ -403,6 +406,7 @@ export default class JigsawGame extends Phaser.Scene {
     if (this.textures.exists('jigsaw-ref')) this.textures.remove('jigsaw-ref');
     this.textures.addCanvas('jigsaw-ref', rcv);
     this.refImage = this.add.image(bcx, bcy, 'jigsaw-ref').setDisplaySize(BOARD.size, BOARD.size).setAlpha(0.16).setDepth(3);
+    if (this.hudCam) this.refImage.cameraFilter = this.hudCam.id; // main camera only
     // Faint full-picture reference: keep on Easy/Medium, hide on Hard/Legendary.
     this.refImage.setVisible(this.difficulty !== 'hard' && this.difficulty !== 'legendary');
 
@@ -500,7 +504,7 @@ export default class JigsawGame extends Phaser.Scene {
     // (pieces must not scatter on top of the target image or they'd be
     // indistinguishable from placed pieces). The HUD lives in viewport space,
     // so it doesn't reserve any of the world.
-    const tray = { x: 40, y: 40, w: WORLD_W - 80, h: WORLD_H - 80 };
+    const tray = { x: 40, y: HUD_H + 40, w: WORLD_W - 80, h: WORLD_H - HUD_H - 80 };
     const boardBox = { x0: BOARD.x - 6, y0: BOARD.y - 6, x1: BOARD.x + BOARD.size + 6, y1: BOARD.y + BOARD.size + 6 };
     const grabR = this.cell * GRAB_FRAC;
     // We guarantee a comfortable minimum centre-gap so no two pieces steal each
@@ -712,7 +716,8 @@ export default class JigsawGame extends Phaser.Scene {
     const cam = this.cameras.main;
     const vw = GAME_WIDTH / cam.zoom, vh = GAME_HEIGHT / cam.zoom;
     cam.scrollX = Phaser.Math.Clamp(cam.scrollX, 0, Math.max(0, WORLD_W - vw));
-    cam.scrollY = Phaser.Math.Clamp(cam.scrollY, 0, Math.max(0, WORLD_H - vh));
+    // Top bound = HUD_H so the play field never slides under the fixed top bar.
+    cam.scrollY = Phaser.Math.Clamp(cam.scrollY, HUD_H, Math.max(HUD_H, WORLD_H - vh));
   }
 
   // Zoom about the point (cx, cy) in canvas space: the world point under that
@@ -741,7 +746,7 @@ export default class JigsawGame extends Phaser.Scene {
   resetToCanvas() {
     const cam = this.cameras.main;
     cam.setZoom(1);
-    cam.setScroll(0, 0);
+    cam.setScroll(0, HUD_H); // top bound so the field never sits under the HUD
   }
 
   setZoomTo(z) {