Cannot accept Harper suggestions in Reddit comments on Brave

**Describe the bug**
Clicking on text highlighted by Harper in Reddit comment text entry boxes does nothing on Brave.

**To Reproduce**
Steps to reproduce the behavior:
1. Type a Reddit comment with a grammatical error in it.
2. Click on the text highlighted by Harper.

**Expected behavior**
Haper should show a pop-up that includes suggestions to improve the text.

**Screenshots**
Not applicable.

**Platform**
OS: MacOS 26.2 (Apple Silicon)
Brave Browser Version: 1.82.173
Chromium Version: 140.0.7339.213
Harper Version: 1.4.1
Websites: Reddit

**Additional context**
None

Reproduce the issue in a Reddit comment box using the reported Brave, macOS, Chromium, and Harper versions, then trace the browser integration involved in handling highlighted text. Done means clicking a Harper-highlighted grammatical error opens a suggestion pop-up in Reddit comments; no files or tests are named in the report.

Written by the indexing model from the issue text.