Add password manager compatibility

[Pebkac03]

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Description

This PR adds relevant autocomplete attributes to password and username input fields for registration and login forms for compatibility with password managers autofill functionality. I've tested and confirmed it works with Bitwarden.

Type of change

• User interface (UI)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
  (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)