Interstellar update: cake day, new user, and bot indicators, several UI changes & fixes

Features

• The user page now shows the date a user joined.
• A user's username now has icon indicators for "Cake Day", "New User" (created within 14 days), and "Bot Account". These indicators show in threads/microblogs, comments, the explore users page, and profile pages.
• Move the thread "Domain" button to the overflow menu, in order to give more room for other UI elements (and since it's not frequently used). It looks like "More from youtube.com".

Fixes

• Decode Lemmy thread and comment responses as utf8; by @olorin99.
• Add a safe area to nav drawer so it doesn't bleed into the status bar on Android.
• Fix the markdown editor's toolbar button sizing.
• Fix post date format so instead of "2024-06-10T18:52:24.000Z", for instance, it shows "June 10, 2024, 6:52:24 PM".
• Fix user profile followers & following inconsistent UI.
• Fix default threads sort setting not saving.