Use JoditEditor's editorRef callback to attach the native paste listener
to the correct HTMLElement (jodit.editor) instead of casting the IJodit
instance to HTMLElement, which caused "t.addEventListener is not a
function" runtime error.

Also resolve uploaded image URLs via resolveUploadUrl so previews render
inside the editor, and ignore the Windows reserved-name "nul" file.

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>