Infinite scrollable area created at the bottom of the Ghost editor

**Describe the bug**
When scrolling to the bottom of a post being edited in the Ghost publishing platform one is unable to reach the end due to an infinite scrollable area that mysteriously exists. In some cases the final element (an HTML card when I've seen this occur) is unreachable as it lays beyond the infinite scrollable area, other times the infinite scrollable area exists beyond the final element (a paragraph or what have you).

**To Reproduce**
Steps to reproduce the behavior:
1. Open up a (pre-written) post in the editor of the Ghost publishing platform
2. Try scrolling to the very bottom
3. See that one can infinitely scroll, in some cases not reaching the final element/paragraph in the post

**Expected behavior**
The end of the post in Ghost's editor should be reachable

**Platform**
Harper 0.55.0 / Firefox 141.0 / Ghost 6.0 / macOS 15.6

Reproduce the issue by opening a pre-written post in the Ghost editor and scrolling to its bottom in the reported environment. Trace the editor's bottom-area layout and scrolling behavior, then verify that the final paragraph or HTML card is reachable and that no scrollable area extends beyond the post.

Written by the indexing model from the issue text.