Reader view mode shifts domain name in the address bar shifts to the righ

Steps to reproduce

1. Open a web page that supports reader view, such as https://en.wikipedia.org/wiki/Firefox
2. Note where the domain name is centered in the address bar:

1. Activate reader view.

Expected behavior

The domain name should stay centered in the address bar:

Actual behavior

The domain name shifts to the right when the shield icon is removed:

Device & build information

• Device: iPhone 16 Plus running iOS 26.2.1 <!--- iPhone model, iOS version -->
• Build version: 147.5 <!--- Visit Settings and scroll down to find the version number -->
• First seen version: 147.5. This bug is a regression in 147.5. The address bar looks correct in 247.4. <!--- Is this new to this version or have you seen it before? -->

:information_source: Reference Person

@FilippoZazzeroni

┆Issue is synchronized with this Jira Task