ENG-965 Fix tldraw image paste positioning bug (#491)

* Center image placement based on shift key

Co-authored-by: mclicks <mclicks@gmail.com>

* rm shift modifier

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: mdroidian

apps/roam/src/components/canvas/Tldraw.tsx

@@ -801,11 +801,13 @@ const InsideEditorAndUiContext = ({
           },
         });
         editor.createAssets([asset]);
+
+        const position = editor.getViewportPageBounds().center;
+
         editor.createShape({
           type: "image",
-          // Center the image in the editor
-          x: (window.innerWidth - size.w) / 2,
-          y: (window.innerHeight - size.h) / 2,
+          x: position.x - size.w / 2,
+          y: position.y - size.h / 2,
           props: { assetId, w: size.w, h: size.h },
         });