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>

---------

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

supabase/migrations/meta/_journal.json

@@ -50,6 +50,20 @@
       "when": 1772216042000,
       "tag": "20260227173402_create_missing_storage_buckets",
       "breakpoints": true
+    },
+    {
+      "idx": 7,
+      "version": "7",
+      "when": 1772222557281,
+      "tag": "20260227200237_brown_quasimodo",
+      "breakpoints": true
+    },
+    {
+      "idx": 8,
+      "version": "7",
+      "when": 1772225008787,
+      "tag": "20260227204328_backfill_empty_projects",
+      "breakpoints": true
     }
   ]
 }