Hover menu overlaps and blocks on first markdown headers

[vimtheeefare]

Description:
There is a positioning bug where the hover action menu physically blocks the text of the first message bubble if it begins with an H1 Markdown header. The menu overlaps the text and intercepts pointer events, making it impossible to highlight or interact with the header.

Steps to Reproduce:

1. Send a message that is the first bubble in the view.
2. Format the top of the message with a Markdown H1 header (e.g., # Header).
3. Attempt to hover over or highlight the header text.

Expected Behavior:
The hover menu offsets appropriately, keeping the underlying text unobstructed and selectable.

Actual Behavior:
The hover menu renders directly on top of the header and steals mouse focus, blocking text selection.