- IntroScene: use bg_main.png poster art as full background, layer
logo.png with a breathing tween aligned to the baked wordmark via
fitted similarity transform constants, and add a double-stroke
"Press any key" prompt (replaced auto-advance with input-only trigger).
- MainMenuScene: replace text title with bg_menu.png background and
centered logo.png overlay; add semi-transparent background pill to
instructions text for readability over the treeline.
- LevelSelectScene: add bg_menu.png background and background pill to
back button text for contrast.
- assetManifest: register bg_main, logo, and bg_menu textures.
- New assets: bg_menu.png, ctc.png, paid.png, bg_main.png, logo.png.
