feat: filter empty projects from public gallery (#125)

* feat(community): filter empty projects from public gallery

Add is_empty column to projects table so the public gallery only shows
projects with actual content. Scene graph emptiness is computed on save
and on creation, and a backfill migration marks existing non-empty
projects. Also cleans up import ordering, fixes README migration path,
and removes stale feedback table migration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Use ESNext modules and bundler resolution

Update packages/db tsconfig to emit ESNext modules and use 'bundler' moduleResolution. This enables modern ESM output and bundler-style resolution for the db package (keeps outDir and rootDir unchanged).

* feat(editor): add dark mode theme and grid visibility toggle

Add theme state to viewer store with light/dark modes, dark-aware
lighting and background colors, grid show/hide toggle in settings,
and theme toggle buttons in the sidebar.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Add ground occluder, animated lighting & UI tweaks

Introduce a ground occluder and smoother animated lighting while adjusting editor UI and icons. Viewer: add GroundOccluder (uses polygon-clipping to union slab/zone polygons) and AnimatedBackground, integrate both into the Canvas; improve Lights to interpolate intensities/colors/ambient for smooth theme transitions. Editor: refactor sidebar header to support inline project title editing and move the theme toggle; replace some lucide icons with image assets and add a settings icon (apps/editor/public/icons/settings.png). Also add polygon-clipping to the viewer package dependencies.

* Update dark mode background color and clean up imports

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/db/tsconfig.json

@@ -2,7 +2,9 @@
   "extends": "@repo/typescript-config/base.json",
   "compilerOptions": {
     "outDir": "dist",
-    "rootDir": "src"
+    "rootDir": "src",
+    "module": "ESNext",
+    "moduleResolution": "bundler"
   },
   "include": ["src"],
   "exclude": ["node_modules", "dist"]