default paintings

DEFAULT_ART_EXPANSION.md

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+# Default Art Expansion / Depth Lighting Tuning
+
+## Depth tuning
+
+Adjusted the depth-local light response so that:
+
+- local light influence stays colorized instead of washing into a neutral gray band,
+- the light source itself and nearby sprite/depth corners catch the strongest highlight,
+- brightness depends less on raw source-to-pixel distance than before,
+- convex edges still read clearly under nearby inspection/night lights.
+
+Implementation areas: `depthLocalLightResponse()`, `getDepthEdgeLightBoost()`, and local-light color mixing inside `shadeAssetPixelColor()` in `app.js`.
+
+## UI bubble correction
+
+- Reduced the selection bubble top offset so the bubble appears closer to the selected sprite.
+
+## New large default works
+
+### Static / building
+- Smile Portrait — 24x32
+- Rosetta Stela — 24x32
+- Pharaoh Mask — 24x32
+- Terracotta Sentinel — 20x32
+
+### Static / nature
+- Great Wave Panel — 32x24
+- Sunflower Still Life — 24x32
+- Stone Circle — 32x24
+
+## Notes
+
+- `assets.json` and `default_assets_sheet.png` were refreshed.
+- The seeded island placement list was expanded so these works appear by default.
+- Save schema was bumped to `25`.