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A self-hosted TiddlyWiki instance (the nodejs-based version, not the single html file approach) might satisfy many of your requirements, albeit not the search preview. https://tiddlywiki.com/
ETA: https://tiddlywiki.com/static/Customising%2520search%2520res...
Yup, totally doable
I think https://simplenote.com fits all your requirements except images. I streamlined images by using services that allows pasting images into the browser (Trello, Glitch, Imgur), then get a link to the image with a single click. (If you abuse StackOverflow's question editor, they even give you the markdown for the image.)
Recently, I have been considering switching to Apple Notes after discovering you can access your notes from a browser. It fits all your requirements except markdown.
If you're on the Apple ecosystem, I really like the simplicity of Bear. You do have to pay a very small fee for it (like maybe $1/mo?) but I've found their interface and tags system to be the best combination of power and simplicity. Apps always work and sync with iCloud.
$1.49 a month or $14.99 annually. And I agree, Bear is awesome. It's fast, it's simple yet powerful (eg. x-callback-url fun), and it stays out of your way. Sync is rock-solid and reliable and requires no effort on my part. It's great for programmers, too. https://bear.app/
So far I have found Evernote to be the least sucky of them all.