feat: add outlet direction (horizontal/vertical), wall light styles, floor textures, and stretch ceiling

- Add configurable outlet direction (horizontal/vertical) stored in metadata
- Add wall light style variants (classic, pendant-globe, sconce-up, sconce-down)
- Add PBR floor textures including natural oak
- Add stretch ceiling offset support with DB migration
- Add furniture surface texture selection
- Add canvas theme colors utility for dark mode support
- Update projection views with improved rendering
- Add EN and RU translations for all new properties

apps/client/src/components/editor/EditorToolbar.tsx

@@ -193,6 +193,16 @@ export function EditorToolbar({ onSave, isSaving, onExport, onImport }: EditorTo
         >
           {t('toolbar.meas')}
         </button>
+        <button
+          className={[
+            styles.toggleBtn,
+            layerVisibility.stretchCeiling ? styles.toggleBtnActive : '',
+          ].join(' ')}
+          onClick={() => dispatch({ type: 'TOGGLE_LAYER', layer: 'stretchCeiling' })}
+          title={t('toolbar.toggleStretchCeiling')}
+        >
+          {t('toolbar.stretchCeiling')}
+        </button>
         <label
           title={t('toolbar.furnitureOpacity') ?? 'Furniture opacity'}
           style={{