[Feature Request] Visual indicator that deadname has been replaced

[indigo121]

As a trans person, I would like to have a visual indicator that my deadname has been removed, so that I am reminded that the service in question still requires that I update the name at some point.

Acceptance Criteria:

1. Feature should be opt in only, so that users who would find the indicator triggering are not subjected to it
2. Indicator should present as a visual marker Immediately following the instance of the corrected name. i.e. if an email contains the text: "Hello , we have some amazing sales to let you know about" user would instead see text: "Hello (!), we have some amazing sales to let you know about"
3. Stretch Goal: instead of automatically displaying the indicator, have the plugin icon in the chrome taskbar indicate that somewhere on the page a deadname has been replaced, and allow selecting an option to highlight any instances