fix(core): report mutations that remove the contentDOM to ProseMirror

[ocavue]

When the selection covers all of a node view's content and the user types, Chrome and Safari delete the whole contentDOM element and insert the typed text into its component-owned parent. shouldIgnoreMutation treats every mutation outside contentDOM as component noise, so ProseMirror never sees the change and the view diverges from the document state silently: the screen shows the typed text while the document keeps the old content, and every later edit in that node is lost too.

This PR reports a childList mutation whose removedNodes include the contentDOM (in both CoreNodeView and CoreMarkView), so ProseMirror reparses the node and takes back control of the DOM. The e2e app gains a react code block node view plus a word-highlight decoration plugin, because the repro needs an inline contentDOM whose fully selected content contains element children, which is exactly the setup of a syntax-highlighted code block.

Note the typed character is still dropped by prosemirror-view's contentLost fallback (it reparses a node with a lost contentDOM as empty), but the state and the DOM now stay consistent and the editor keeps working, which matches how a plain toDOM-rendered node behaves in the same scenario.

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Project	Deployment	Actions	Updated (UTC)
prosemirror-adapter-e2e	Ready	Preview, Comment	Jul 6, 2026 1:20pm

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commit: 540c661