Restore background (#2037)

This PR restores the missing background component (which includes the
background color).

### Change Type

- [x] `patch` — Bug fix

packages/editor/editor.css

@@ -273,6 +273,7 @@ input,
 
 .tl-background {
 	position: absolute;
+	background-color: var(--color-background);
 	inset: 0px;
 }
 

packages/editor/src/lib/hooks/useEditorComponents.tsx

@@ -1,6 +1,9 @@
 import { createContext, useContext, useMemo } from 'react'
 import { ShapeIndicator, TLShapeIndicatorComponent } from '../components/ShapeIndicator'
-import { TLBackgroundComponent } from '../components/default-components/DefaultBackground'
+import {
+	DefaultBackground,
+	TLBackgroundComponent,
+} from '../components/default-components/DefaultBackground'
 import { DefaultBrush, TLBrushComponent } from '../components/default-components/DefaultBrush'
 import {
 	DefaultCollaboratorHint,
@@ -88,7 +91,7 @@ export function EditorComponentsProvider({ overrides, children }: ComponentsCont
 		<EditorComponentsContext.Provider
 			value={useMemo(
 				() => ({
-					Background: null,
+					Background: DefaultBackground,
 					SvgDefs: DefaultSvgDefs,
 					Brush: DefaultBrush,
 					ZoomBrush: DefaultBrush,

packages/tldraw/api/api.json

@@ -13548,34 +13548,6 @@
                 "startIndex": 1,
                 "endIndex": 2
               }
-            },
-            {
-              "kind": "PropertySignature",
-              "canonicalReference": "@tldraw/tldraw!TldrawUiBaseProps#topZone:member",
-              "docComment": "/**\n * A component to use for the top zone (will be deprecated)\n */\n",
-              "excerptTokens": [
-                {
-                  "kind": "Content",
-                  "text": "topZone?: "
-                },
-                {
-                  "kind": "Reference",
-                  "text": "ReactNode",
-                  "canonicalReference": "@types/react!React.ReactNode:type"
-                },
-                {
-                  "kind": "Content",
-                  "text": ";"
-                }
-              ],
-              "isReadonly": false,
-              "isOptional": true,
-              "releaseTag": "Public",
-              "name": "topZone",
-              "propertyTypeTokenRange": {
-                "startIndex": 1,
-                "endIndex": 2
-              }
             }
           ],
           "extendsTokenRanges": []