Error on Settings

**Describe the bug**
Using Phanpy with [GoToSocial](https://github.com/superseriousbusiness/gotosocial). When going to "Settings" I am getting a small bubble at the top of the page stating:

> Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.

Can't enable notifications either. I get:

> Failed to update subcription. Please try again.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'Settings'.
2. See error on bubble at the top of the page.
3. Click on "Allow from Anyone", and pick "Follow", etc.
4. See error on bubble at the top of the page.

**Expected behavior**
I would expect for things to work.

**Desktop (please complete the following information):**
- OS: Ubuntu Linux 24.04
- Browser: Chrome
- Version: 125.0.6422.112

Not sure if this is something not supported by GoToSocial.

Start by reproducing the error in Chrome with GoToSocial, following the Settings and notification steps in the issue. Trace the Settings page's atob usage and the notification subscription update flow to identify which input fails, then verify both actions work with the reported setup.

Written by the indexing model from the issue text.