- Create `src/data/themes.js` with theme definitions (background color, parallax layers) and a `getTheme()` resolver that falls back to campaign 1's default look
- Update `PlayScene` to load the active campaign's theme instead of hardcoding colors/texture keys
- Register campaign 2's `_2` background assets in the asset manifest with placeholder fallbacks
- Add updated background art for campaign 2 (`bg_far_2.png`)
Brian Fertig