📝 Add docstrings to v3

[coderabbitai]

Docstrings generation was requested by @Abhid1239.

• docs: Add comprehensive technical documentation and refine extension … #1 (comment)

The following files were modified:

• content-settings.js
• content-state.js
• content-ui.js
• popup.js

These file types are not supported

• DOCUMENTATION.md
• manifest.json
• popup.css
• popup.html

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