Switch to Tiptap

[octet-stream]

Maintaining WYSIWYG editor based on Plate have become an abysmal experience, because they introduce too many breaking changes every so often. For such small needs it is too much, so I want to consider alternatives. That would also mean I will introduce breaking changes for post content schema and rendering. For now I look at Tiptap as good candidate for replacement.

What do I need so far:

• Port text editor to Tiptap.
• Support new schema.
• Ideally: Re-use same styles and primitives (shadcn/ui) in editor components.
• Rewrite rendering, but keep it static: https://tiptap.dev/docs/editor/api/utilities/html
• Ideally, but optional: keep backwards compatibility to smoothen transition. I don't think I have any users, so this is unnecessary.